21155334616352 has 24 divisors (see below), whose sum is σ = 41649925255596. Its totient is φ = 10577575821312.

The previous prime is 21155334616307. The next prime is 21155334616363. The reversal of 21155334616352 is 25361643355112.

It can be written as a sum of positive squares in 2 ways, for example, as 16628159239696 + 4527175376656 = 4077764^2 + 2127716^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21155334616297 and 21155334616306.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 977888 + ... + 6577760.

Almost surely, 2^{21155334616352} is an apocalyptic number.

It is an amenable number.

21155334616352 is a deficient number, since it is larger than the sum of its proper divisors (20494590639244).

21155334616352 is a wasteful number, since it uses less digits than its factorization.

21155334616352 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5717940 (or 5717932 counting only the distinct ones).

The product of its digits is 1944000, while the sum is 47.

The spelling of 21155334616352 in words is "twenty-one trillion, one hundred fifty-five billion, three hundred thirty-four million, six hundred sixteen thousand, three hundred fifty-two".