21829964 has 24 divisors (see below), whose sum is σ = 41369328. Its totient is φ = 10019520.

The previous prime is 21829961. The next prime is 21829979. The reversal of 21829964 is 46992812.

It is not an unprimeable number, because it can be changed into a prime (21829961) by changing a digit.

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, 9179 + ... + 11309.

It is an arithmetic number, because the mean of its divisors is an integer number (1723722).

Almost surely, 2^21829964 is an apocalyptic number.

It is an amenable number.

21829964 is a deficient number, since it is larger than the sum of its proper divisors (19539364).

21829964 is a wasteful number, since it uses less digits than its factorization.

21829964 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2345 (or 2343 counting only the distinct ones).

The product of its digits is 62208, while the sum is 41.

The square root of 21829964 is about 4672.2547019614. The cubic root of 21829964 is about 279.4801749886.

The spelling of 21829964 in words is "twenty-one million, eight hundred twenty-nine thousand, nine hundred sixty-four".