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221421255544717 is a prime number
BaseRepresentation
bin110010010110000110100111…
…010010000100111110001101
31002000222122222000010220111221
4302112012213102010332031
5213010231212404412332
62102531304234243341
764432105061211544
oct6226064722047615
91060878860126457
10221421255544717
1164608255350a58
1220a00b0a586551
139671c1c9c5977
143c96bbb40115b
151a8ea1d15e297
hexc961a7484f8d

221421255544717 has 2 divisors, whose sum is σ = 221421255544718. Its totient is φ = 221421255544716.

The previous prime is 221421255544681. The next prime is 221421255544787. The reversal of 221421255544717 is 717445552124122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 221098729233321 + 322526311396 = 14869389^2 + 567914^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-221421255544717 is a prime.

It is a super-2 number, since 2×2214212555447172 (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221421255544787) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110710627772358 + 110710627772359.

It is an arithmetic number, because the mean of its divisors is an integer number (110710627772359).

Almost surely, 2221421255544717 is an apocalyptic number.

It is an amenable number.

221421255544717 is a deficient number, since it is larger than the sum of its proper divisors (1).

221421255544717 is an equidigital number, since it uses as much as digits as its factorization.

221421255544717 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6272000, while the sum is 52.

The spelling of 221421255544717 in words is "two hundred twenty-one trillion, four hundred twenty-one billion, two hundred fifty-five million, five hundred forty-four thousand, seven hundred seventeen".