221656427711431 has 4 divisors (see below), whose sum is σ = 224146949371200. Its totient is φ = 219165906051664.

The previous prime is 221656427711401. The next prime is 221656427711443. The reversal of 221656427711431 is 134117724656122.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 221656427711431 - 2⁴⁷ = 80918939356103 is a prime.

It is a super-2 number, since 2×221656427711431² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221656427711401) 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 in 3 ways as a sum of consecutive naturals, for example, 1245260829751 + ... + 1245260829928.

It is an arithmetic number, because the mean of its divisors is an integer number (56036737342800).

Almost surely, 2^{221656427711431} is an apocalyptic number.

221656427711431 is a deficient number, since it is larger than the sum of its proper divisors (2490521659769).

221656427711431 is an equidigital number, since it uses as much as digits as its factorization.

221656427711431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2490521659768.

The product of its digits is 3386880, while the sum is 52.

The spelling of 221656427711431 in words is "two hundred twenty-one trillion, six hundred fifty-six billion, four hundred twenty-seven million, seven hundred eleven thousand, four hundred thirty-one".