21312301332 has 48 divisors (see below), whose sum is σ = 57038038400. Its totient is φ = 6067239552.

The previous prime is 21312301327. The next prime is 21312301337. The reversal of 21312301332 is 23310321312.

It is an interprime number because it is at equal distance from previous prime (21312301327) and next prime (21312301337).

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 21312301299 and 21312301308.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21312301337) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 434707 + ... + 481242.

Almost surely, 2^21312301332 is an apocalyptic number.

It is an amenable number.

21312301332 is an abundant number, since it is smaller than the sum of its proper divisors (35725737068).

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

21312301332 is a wasteful number, since it uses less digits than its factorization.

21312301332 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 916240 (or 916238 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 21.

Adding to 21312301332 its reverse (23310321312), we get a palindrome (44622622644).

The spelling of 21312301332 in words is "twenty-one billion, three hundred twelve million, three hundred one thousand, three hundred thirty-two".