21312132152 has 16 divisors (see below), whose sum is σ = 39967174440. Its totient is φ = 10654218976.

The previous prime is 21312132071. The next prime is 21312132199. The reversal of 21312132152 is 25123121312.

It is a super-2 number, since 2×21312132152² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 181223 + ... + 274710.

Almost surely, 2^21312132152 is an apocalyptic number.

It is an amenable number.

21312132152 is a deficient number, since it is larger than the sum of its proper divisors (18655042288).

21312132152 is a wasteful number, since it uses less digits than its factorization.

21312132152 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 461782 (or 461778 counting only the distinct ones).

The product of its digits is 720, while the sum is 23.

Adding to 21312132152 its reverse (25123121312), we get a palindrome (46435253464).

The spelling of 21312132152 in words is "twenty-one billion, three hundred twelve million, one hundred thirty-two thousand, one hundred fifty-two".