20231521553205 has 12 divisors (see below), whose sum is σ = 35067970692300. Its totient is φ = 10790144828352.

The previous prime is 20231521553183. The next prime is 20231521553231. The reversal of 20231521553205 is 50235512513202.

20231521553205 is a `hidden beast` number, since 2 + 0 + 2 + 31 + 52 + 1 + 553 + 20 + 5 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 3798219005604 + 16433302547601 = 1948902^2 + 4053801^2 .

It is not a de Polignac number, because 20231521553205 - 2¹⁵ = 20231521520437 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20231521553205.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 224794683880 + ... + 224794683969.

It is an arithmetic number, because the mean of its divisors is an integer number (2922330891025).

Almost surely, 2^{20231521553205} is an apocalyptic number.

It is an amenable number.

20231521553205 is a deficient number, since it is larger than the sum of its proper divisors (14836449139095).

20231521553205 is a wasteful number, since it uses less digits than its factorization.

20231521553205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 449589367860 (or 449589367857 counting only the distinct ones).

The product of its (nonzero) digits is 90000, while the sum is 36.

The spelling of 20231521553205 in words is "twenty trillion, two hundred thirty-one billion, five hundred twenty-one million, five hundred fifty-three thousand, two hundred five".