16021213656 has 72 divisors (see below), whose sum is σ = 46604931660. Its totient is φ = 4576249440.

The previous prime is 16021213651. The next prime is 16021213697. The reversal of 16021213656 is 65631212061.

It is a super-2 number, since 2×16021213656² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16021213651) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 4338771 + ... + 4342461.

Almost surely, 2^16021213656 is an apocalyptic number.

It is an amenable number.

16021213656 is an abundant number, since it is smaller than the sum of its proper divisors (30583718004).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16021213656 is an frugal number, since it uses more digits than its factorization.

16021213656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7405 (or 3703 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 33.

The spelling of 16021213656 in words is "sixteen billion, twenty-one million, two hundred thirteen thousand, six hundred fifty-six".