221534403654701 has 2 divisors, whose sum is σ = 221534403654702. Its totient is φ = 221534403654700.

The previous prime is 221534403654673. The next prime is 221534403654763. The reversal of 221534403654701 is 107456304435122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 195197503116100 + 26336900538601 = 13971310^2 + 5131949^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221534403654701 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221534403654791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110767201827350 + 110767201827351.

It is an arithmetic number, because the mean of its divisors is an integer number (110767201827351).

Almost surely, 2^{221534403654701} is an apocalyptic number.

It is an amenable number.

221534403654701 is a deficient number, since it is larger than the sum of its proper divisors (1).

221534403654701 is an equidigital number, since it uses as much as digits as its factorization.

221534403654701 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2419200, while the sum is 47.

The spelling of 221534403654701 in words is "two hundred twenty-one trillion, five hundred thirty-four billion, four hundred three million, six hundred fifty-four thousand, seven hundred one".