21132426 has 24 divisors (see below), whose sum is σ = 49165920. Its totient is φ = 6037752.

The previous prime is 21132383. The next prime is 21132481. The reversal of 21132426 is 62423112.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 35646 + ... + 36233.

It is an arithmetic number, because the mean of its divisors is an integer number (2048580).

Almost surely, 2^21132426 is an apocalyptic number.

21132426 is an abundant number, since it is smaller than the sum of its proper divisors (28033494).

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

21132426 is a wasteful number, since it uses less digits than its factorization.

21132426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71898 (or 71891 counting only the distinct ones).

The product of its digits is 576, while the sum is 21.

The square root of 21132426 is about 4597.0018490316. The cubic root of 21132426 is about 276.4711287485.

Adding to 21132426 its reverse (62423112), we get a palindrome (83555538).

The spelling of 21132426 in words is "twenty-one million, one hundred thirty-two thousand, four hundred twenty-six".