21365752 has 8 divisors (see below), whose sum is σ = 40060800. Its totient is φ = 10682872.

The previous prime is 21365749. The next prime is 21365759. The reversal of 21365752 is 25756312.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21365759) 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 as a sum of consecutive naturals, namely, 1335352 + ... + 1335367.

It is an arithmetic number, because the mean of its divisors is an integer number (5007600).

Almost surely, 2^21365752 is an apocalyptic number.

It is an amenable number.

21365752 is a deficient number, since it is larger than the sum of its proper divisors (18695048).

21365752 is a wasteful number, since it uses less digits than its factorization.

21365752 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2670725 (or 2670721 counting only the distinct ones).

The product of its digits is 12600, while the sum is 31.

The square root of 21365752 is about 4622.3102448884. The cubic root of 21365752 is about 277.4849251882.

The spelling of 21365752 in words is "twenty-one million, three hundred sixty-five thousand, seven hundred fifty-two".