16331611157221 has 8 divisors (see below), whose sum is σ = 17191221408000. Its totient is φ = 15472006083360.

The previous prime is 16331611157137. The next prime is 16331611157237. The reversal of 16331611157221 is 12275111613361.

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 16331611157221 - 2⁹ = 16331611156709 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16331611151221) 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, 6334161 + ... + 8531401.

It is an arithmetic number, because the mean of its divisors is an integer number (2148902676000).

Almost surely, 2^{16331611157221} is an apocalyptic number.

It is an amenable number.

16331611157221 is a deficient number, since it is larger than the sum of its proper divisors (859610250779).

16331611157221 is a wasteful number, since it uses less digits than its factorization.

16331611157221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2588459.

The product of its digits is 45360, while the sum is 40.

The spelling of 16331611157221 in words is "sixteen trillion, three hundred thirty-one billion, six hundred eleven million, one hundred fifty-seven thousand, two hundred twenty-one".