221611646234431 has 8 divisors (see below), whose sum is σ = 221659129411200. Its totient is φ = 221564165970840.

The previous prime is 221611646234423. The next prime is 221611646234441. The reversal of 221611646234431 is 134432646116122.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 221611646234431 - 2³ = 221611646234423 is a prime.

It is a super-2 number, since 2×221611646234431² (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 (221611646234441) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 154986760 + ... + 156410098.

It is an arithmetic number, because the mean of its divisors is an integer number (27707391176400).

Almost surely, 2^{221611646234431} is an apocalyptic number.

221611646234431 is a deficient number, since it is larger than the sum of its proper divisors (47483176769).

221611646234431 is a wasteful number, since it uses less digits than its factorization.

221611646234431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1456589.

The product of its digits is 995328, while the sum is 46.

The spelling of 221611646234431 in words is "two hundred twenty-one trillion, six hundred eleven billion, six hundred forty-six million, two hundred thirty-four thousand, four hundred thirty-one".