21213876 has 24 divisors (see below), whose sum is σ = 50837920. Its totient is φ = 6880032.

The previous prime is 21213859. The next prime is 21213893. The reversal of 21213876 is 67831212.

It is an interprime number because it is at equal distance from previous prime (21213859) and next prime (21213893).

It is a congruent number.

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, 23446 + ... + 24333.

Almost surely, 2^21213876 is an apocalyptic number.

It is an amenable number.

21213876 is an abundant number, since it is smaller than the sum of its proper divisors (29624044).

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

21213876 is a wasteful number, since it uses less digits than its factorization.

21213876 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47823 (or 47821 counting only the distinct ones).

The product of its digits is 4032, while the sum is 30.

The square root of 21213876 is about 4605.8523641124. The cubic root of 21213876 is about 276.8258711772.

The spelling of 21213876 in words is "twenty-one million, two hundred thirteen thousand, eight hundred seventy-six".