21736432 has 20 divisors (see below), whose sum is σ = 42338560. Its totient is φ = 10810368.

The previous prime is 21736417. The next prime is 21736433. The reversal of 21736432 is 23463712.

It is a self number, because there is not a number n which added to its sum of digits gives 21736432.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21736433) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 432 + ... + 6607.

It is an arithmetic number, because the mean of its divisors is an integer number (2116928).

Almost surely, 2^21736432 is an apocalyptic number.

It is an amenable number.

21736432 is a deficient number, since it is larger than the sum of its proper divisors (20602128).

21736432 is a wasteful number, since it uses less digits than its factorization.

21736432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7240 (or 7234 counting only the distinct ones).

The product of its digits is 6048, while the sum is 28.

The square root of 21736432 is about 4662.2346573290. The cubic root of 21736432 is about 279.0804528114.

The spelling of 21736432 in words is "twenty-one million, seven hundred thirty-six thousand, four hundred thirty-two".