21206162152 has 32 divisors (see below), whose sum is σ = 45467997120. Its totient is φ = 9083111040.

The previous prime is 21206162149. The next prime is 21206162249. The reversal of 21206162152 is 25126160212.

It is a super-2 number, since 2×21206162152² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a self number, because there is not a number n which added to its sum of digits gives 21206162152.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10549 + ... + 206212.

It is an arithmetic number, because the mean of its divisors is an integer number (1420874910).

Almost surely, 2^21206162152 is an apocalyptic number.

It is an amenable number.

21206162152 is an abundant number, since it is smaller than the sum of its proper divisors (24261834968).

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

21206162152 is a wasteful number, since it uses less digits than its factorization.

21206162152 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 218521 (or 218517 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 28.

The spelling of 21206162152 in words is "twenty-one billion, two hundred six million, one hundred sixty-two thousand, one hundred fifty-two".