21329496 has 24 divisors (see below), whose sum is σ = 57767580. Its totient is φ = 7109808.

The previous prime is 21329489. The next prime is 21329507. The reversal of 21329496 is 69492312.

It is a tau number, because it is divible by the number of its divisors (24).

It is a super-2 number, since 2×21329496² = 909894799228032, 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 21329496.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 148050 + ... + 148193.

Almost surely, 2^21329496 is an apocalyptic number.

It is an amenable number.

21329496 is an abundant number, since it is smaller than the sum of its proper divisors (36438084).

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

21329496 is a wasteful number, since it uses less digits than its factorization.

21329496 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 296255 (or 296248 counting only the distinct ones).

The product of its digits is 23328, while the sum is 36.

The square root of 21329496 is about 4618.3867313165. The cubic root of 21329496 is about 277.3278796285.

It can be divided in two parts, 2132 and 9496, that added together give a triangular number (11628 = T₁₅₂).

The spelling of 21329496 in words is "twenty-one million, three hundred twenty-nine thousand, four hundred ninety-six".