21262136 has 16 divisors (see below), whose sum is σ = 45561840. Its totient is φ = 9112320.

The previous prime is 21262117. The next prime is 21262147. The reversal of 21262136 is 63126212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 189785 + ... + 189896.

It is an arithmetic number, because the mean of its divisors is an integer number (2847615).

Almost surely, 2^21262136 is an apocalyptic number.

It is an amenable number.

21262136 is an abundant number, since it is smaller than the sum of its proper divisors (24299704).

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

21262136 is a wasteful number, since it uses less digits than its factorization.

21262136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 379694 (or 379690 counting only the distinct ones).

The product of its digits is 864, while the sum is 23.

The square root of 21262136 is about 4611.0883747766. The cubic root of 21262136 is about 277.0356316599.

Adding to 21262136 its reverse (63126212), we get a palindrome (84388348).

The spelling of 21262136 in words is "twenty-one million, two hundred sixty-two thousand, one hundred thirty-six".