21475902 has 32 divisors (see below), whose sum is σ = 49404672. Its totient is φ = 6096384.

The previous prime is 21475889. The next prime is 21475907. The reversal of 21475902 is 20957412.

It is a super-2 number, since 2×21475902² = 922428733427208, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21475902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21475907) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5278 + ... + 8414.

It is an arithmetic number, because the mean of its divisors is an integer number (1543896).

Almost surely, 2^21475902 is an apocalyptic number.

21475902 is an abundant number, since it is smaller than the sum of its proper divisors (27928770).

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

21475902 is a wasteful number, since it uses less digits than its factorization.

21475902 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3312.

The product of its (nonzero) digits is 5040, while the sum is 30.

The square root of 21475902 is about 4634.2099650318. The cubic root of 21475902 is about 277.9609609967.

The spelling of 21475902 in words is "twenty-one million, four hundred seventy-five thousand, nine hundred two".