21311322053512 has 32 divisors (see below), whose sum is σ = 40721172298200. Its totient is φ = 10452426776064.

The previous prime is 21311322053501. The next prime is 21311322053521. The reversal of 21311322053512 is 21535022311312.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 18955974991716 + 2355347061796 = 4353846^2 + 1534714^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3217173 + ... + 7278244.

Almost surely, 2^{21311322053512} is an apocalyptic number.

It is an amenable number.

21311322053512 is a deficient number, since it is larger than the sum of its proper divisors (19409850244688).

21311322053512 is a wasteful number, since it uses less digits than its factorization.

21311322053512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10500265 (or 10500261 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 31.

Adding to 21311322053512 its reverse (21535022311312), we get a palindrome (42846344364824).

The spelling of 21311322053512 in words is "twenty-one trillion, three hundred eleven billion, three hundred twenty-two million, fifty-three thousand, five hundred twelve".