21474936 has 96 divisors (see below), whose sum is σ = 69426000. Its totient is φ = 6132672.

The previous prime is 21474919. The next prime is 21474941. The reversal of 21474936 is 63947412.

It is a super-2 number, since 2×21474936² = 922345752408192, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

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

It is a self number, because there is not a number n which added to its sum of digits gives 21474936.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9570 + ... + 11598.

Almost surely, 2^21474936 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21474936, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34713000).

21474936 is an abundant number, since it is smaller than the sum of its proper divisors (47951064).

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

21474936 is a wasteful number, since it uses less digits than its factorization.

21474936 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2058 (or 2041 counting only the distinct ones).

The product of its digits is 36288, while the sum is 36.

The square root of 21474936 is about 4634.1057389749. The cubic root of 21474936 is about 277.9567933128.

The spelling of 21474936 in words is "twenty-one million, four hundred seventy-four thousand, nine hundred thirty-six".