21206888 has 64 divisors (see below), whose sum is σ = 46008000. Its totient is φ = 9096192.

The previous prime is 21206873. The next prime is 21206891. The reversal of 21206888 is 88860212.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 74795 + ... + 75077.

It is an arithmetic number, because the mean of its divisors is an integer number (718875).

Almost surely, 2^21206888 is an apocalyptic number.

It is an amenable number.

21206888 is an abundant number, since it is smaller than the sum of its proper divisors (24801112).

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

21206888 is a wasteful number, since it uses less digits than its factorization.

21206888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 354 (or 350 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 35.

The square root of 21206888 is about 4605.0937015440. The cubic root of 21206888 is about 276.7954717091.

The spelling of 21206888 in words is "twenty-one million, two hundred six thousand, eight hundred eighty-eight".