21246736 has 40 divisors (see below), whose sum is σ = 49818240. Its totient is φ = 8569344.

The previous prime is 21246721. The next prime is 21246751. The reversal of 21246736 is 63764212.

It is an interprime number because it is at equal distance from previous prime (21246721) and next prime (21246751).

It is a junction number, because it is equal to n+sod(n) for n = 21246698 and 21246707.

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, 3676 + ... + 7483.

It is an arithmetic number, because the mean of its divisors is an integer number (1245456).

Almost surely, 2^21246736 is an apocalyptic number.

It is an amenable number.

21246736 is an abundant number, since it is smaller than the sum of its proper divisors (28571504).

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

21246736 is a wasteful number, since it uses less digits than its factorization.

21246736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11191 (or 11185 counting only the distinct ones).

The product of its digits is 12096, while the sum is 31.

The square root of 21246736 is about 4609.4181845435. The cubic root of 21246736 is about 276.9687305864.

The spelling of 21246736 in words is "twenty-one million, two hundred forty-six thousand, seven hundred thirty-six".