21246636 has 24 divisors (see below), whose sum is σ = 52185280. Its totient is φ = 6709392.

The previous prime is 21246629. The next prime is 21246637. The reversal of 21246636 is 63664212.

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (21246637) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46366 + ... + 46821.

Almost surely, 2^21246636 is an apocalyptic number.

It is an amenable number.

21246636 is an abundant number, since it is smaller than the sum of its proper divisors (30938644).

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

21246636 is a wasteful number, since it uses less digits than its factorization.

21246636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93213 (or 93211 counting only the distinct ones).

The product of its digits is 10368, while the sum is 30.

The square root of 21246636 is about 4609.4073371747. The cubic root of 21246636 is about 276.9682960583.

The spelling of 21246636 in words is "twenty-one million, two hundred forty-six thousand, six hundred thirty-six".