21369832 has 32 divisors (see below), whose sum is σ = 46015200. Its totient is φ = 9201600.

The previous prime is 21369811. The next prime is 21369847. The reversal of 21369832 is 23896312.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4719 + ... + 8062.

It is an arithmetic number, because the mean of its divisors is an integer number (1437975).

Almost surely, 2^21369832 is an apocalyptic number.

21369832 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21369832 is an abundant number, since it is smaller than the sum of its proper divisors (24645368).

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

21369832 is a wasteful number, since it uses less digits than its factorization.

21369832 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12817 (or 12813 counting only the distinct ones).

The product of its digits is 15552, while the sum is 34.

The square root of 21369832 is about 4622.7515615702. The cubic root of 21369832 is about 277.5025868871.

It can be divided in two parts, 21369 and 832, that added together give a square (22201 = 149²).

The spelling of 21369832 in words is "twenty-one million, three hundred sixty-nine thousand, eight hundred thirty-two".