16221020252 has 24 divisors (see below), whose sum is σ = 29935530240. Its totient is φ = 7669574640.

The previous prime is 16221020251. The next prime is 16221020267. The reversal of 16221020252 is 25202012261.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16221020251) 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, 153524 + ... + 236667.

It is an arithmetic number, because the mean of its divisors is an integer number (1247313760).

Almost surely, 2^16221020252 is an apocalyptic number.

It is an amenable number.

16221020252 is a deficient number, since it is larger than the sum of its proper divisors (13714509988).

16221020252 is a wasteful number, since it uses less digits than its factorization.

16221020252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 390761 (or 390759 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 23.

The spelling of 16221020252 in words is "sixteen billion, two hundred twenty-one million, twenty thousand, two hundred fifty-two".