21311352312 has 16 divisors (see below), whose sum is σ = 53278380840. Its totient is φ = 7103784096.

The previous prime is 21311352277. The next prime is 21311352341. The reversal of 21311352312 is 21325311312.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (24), and also a Moran number because the ratio is a prime number: 887973013 = 21311352312 / (2 + 1 + 3 + 1 + 1 + 3 + 5 + 2 + 3 + 1 + 2).

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 443986483 + ... + 443986530.

Almost surely, 2^21311352312 is an apocalyptic number.

It is an amenable number.

21311352312 is an abundant number, since it is smaller than the sum of its proper divisors (31967028528).

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

21311352312 is a wasteful number, since it uses less digits than its factorization.

21311352312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 887973022 (or 887973018 counting only the distinct ones).

The product of its digits is 1080, while the sum is 24.

Adding to 21311352312 its reverse (21325311312), we get a palindrome (42636663624).

The spelling of 21311352312 in words is "twenty-one billion, three hundred eleven million, three hundred fifty-two thousand, three hundred twelve".