21364352 has 16 divisors (see below), whose sum is σ = 42562050. Its totient is φ = 10682112.

The previous prime is 21364351. The next prime is 21364373. The reversal of 21364352 is 25346312.

It can be written as a sum of positive squares in only one way, i.e., 18181696 + 3182656 = 4264^2 + 1784^2 .

It is a tau number, because it is divible by the number of its divisors (16).

It is not an unprimeable number, because it can be changed into a prime (21364351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83327 + ... + 83582.

Almost surely, 2^21364352 is an apocalyptic number.

It is an amenable number.

21364352 is a deficient number, since it is larger than the sum of its proper divisors (21197698).

21364352 is an equidigital number, since it uses as much as digits as its factorization.

21364352 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166923 (or 166911 counting only the distinct ones).

The product of its digits is 4320, while the sum is 26.

The square root of 21364352 is about 4622.1588029837. The cubic root of 21364352 is about 277.4788642832.

The spelling of 21364352 in words is "twenty-one million, three hundred sixty-four thousand, three hundred fifty-two".