21246090 has 32 divisors (see below), whose sum is σ = 53991360. Its totient is φ = 5332224.

The previous prime is 21246079. The next prime is 21246101. The reversal of 21246090 is 9064212.

It is an interprime number because it is at equal distance from previous prime (21246079) and next prime (21246101).

It is a self number, because there is not a number n which added to its sum of digits gives 21246090.

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, 20320 + ... + 21339.

It is an arithmetic number, because the mean of its divisors is an integer number (1687230).

Almost surely, 2^21246090 is an apocalyptic number.

21246090 is an abundant number, since it is smaller than the sum of its proper divisors (32745270).

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

21246090 is a wasteful number, since it uses less digits than its factorization.

21246090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41686.

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 21246090 is about 4609.3481100911. The cubic root of 21246090 is about 276.9659235103.

The spelling of 21246090 in words is "twenty-one million, two hundred forty-six thousand, ninety".