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BaseRepresentation
bin110010010110000110100111…
…010010000100111101101001
31002000222122222000010220110121
4302112012213102010331221
5213010231212404412211
62102531304234243241
764432105061211463
oct6226064722047551
91060878860126417
10221421255544681
1164608255350a25
1220a00b0a586521
139671c1c9c594a
143c96bbb401133
151a8ea1d15e271
hexc961a7484f69

221421255544681 has 2 divisors, whose sum is σ = 221421255544682. Its totient is φ = 221421255544680.

The previous prime is 221421255544669. The next prime is 221421255544717. The reversal of 221421255544681 is 186445552124122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 204962744910400 + 16458510634281 = 14316520^2 + 4056909^2 .

It is a cyclic number.

It is not a de Polignac number, because 221421255544681 - 217 = 221421255413609 is a prime.

It is a super-2 number, since 2×2214212555446812 (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (221421255544661) 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, 110710627772340 + 110710627772341.

It is an arithmetic number, because the mean of its divisors is an integer number (110710627772341).

Almost surely, 2221421255544681 is an apocalyptic number.

It is an amenable number.

221421255544681 is a deficient number, since it is larger than the sum of its proper divisors (1).

221421255544681 is an equidigital number, since it uses as much as digits as its factorization.

221421255544681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6144000, while the sum is 52.

The spelling of 221421255544681 in words is "two hundred twenty-one trillion, four hundred twenty-one billion, two hundred fifty-five million, five hundred forty-four thousand, six hundred eighty-one".