21629472 has 24 divisors (see below), whose sum is σ = 56777616. Its totient is φ = 7209792.

The previous prime is 21629471. The next prime is 21629477. The reversal of 21629472 is 27492612.

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

It is not an unprimeable number, because it can be changed into a prime (21629471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 112558 + ... + 112749.

It is an arithmetic number, because the mean of its divisors is an integer number (2365734).

Almost surely, 2^21629472 is an apocalyptic number.

It is an amenable number.

21629472 is an abundant number, since it is smaller than the sum of its proper divisors (35148144).

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

21629472 is a wasteful number, since it uses less digits than its factorization.

21629472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 225320 (or 225312 counting only the distinct ones).

The product of its digits is 12096, while the sum is 33.

The square root of 21629472 is about 4650.7496169972. The cubic root of 21629472 is about 278.6219362538.

The spelling of 21629472 in words is "twenty-one million, six hundred twenty-nine thousand, four hundred seventy-two".