21410920 has 16 divisors (see below), whose sum is σ = 48174660. Its totient is φ = 8564352.

The previous prime is 21410911. The next prime is 21410933. The reversal of 21410920 is 2901412.

It can be written as a sum of positive squares in 2 ways, for example, as 20811844 + 599076 = 4562^2 + 774^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 267597 + ... + 267676.

Almost surely, 2^21410920 is an apocalyptic number.

21410920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21410920 is an abundant number, since it is smaller than the sum of its proper divisors (26763740).

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

21410920 is a wasteful number, since it uses less digits than its factorization.

21410920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 535284 (or 535280 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 21410920 is about 4627.1935338821. The cubic root of 21410920 is about 277.6803254001.

The spelling of 21410920 in words is "twenty-one million, four hundred ten thousand, nine hundred twenty".