21315433352 has 8 divisors (see below), whose sum is σ = 39966437550. Its totient is φ = 10657716672.

The previous prime is 21315433331. The next prime is 21315433393. The reversal of 21315433352 is 25333451312.

It can be written as a sum of positive squares in only one way, i.e., 20179338916 + 1136094436 = 142054^2 + 33706^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1332214577 + ... + 1332214592.

Almost surely, 2^21315433352 is an apocalyptic number.

It is an amenable number.

21315433352 is a deficient number, since it is larger than the sum of its proper divisors (18651004198).

21315433352 is a wasteful number, since it uses less digits than its factorization.

21315433352 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2664429175 (or 2664429171 counting only the distinct ones).

The product of its digits is 32400, while the sum is 32.

Adding to 21315433352 its reverse (25333451312), we get a palindrome (46648884664).

The spelling of 21315433352 in words is "twenty-one billion, three hundred fifteen million, four hundred thirty-three thousand, three hundred fifty-two".