16213021956 has 36 divisors (see below), whose sum is σ = 41007653232. Its totient is φ = 5401078704.

The previous prime is 16213021949. The next prime is 16213021969. The reversal of 16213021956 is 65912031261.

16213021956 is a `hidden beast` number, since 1 + 621 + 3 + 0 + 21 + 9 + 5 + 6 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 16213021956.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 75070 + ... + 195093.

Almost surely, 2^16213021956 is an apocalyptic number.

It is an amenable number.

16213021956 is an abundant number, since it is smaller than the sum of its proper divisors (24794631276).

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

16213021956 is a wasteful number, since it uses less digits than its factorization.

16213021956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 271840 (or 271835 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 36.

The spelling of 16213021956 in words is "sixteen billion, two hundred thirteen million, twenty-one thousand, nine hundred fifty-six".