21515410552050 has 36 divisors (see below), whose sum is σ = 57804736351050. Its totient is φ = 5737442813760.

The previous prime is 21515410552043. The next prime is 21515410552063. The reversal of 21515410552050 is 5025501451512.

21515410552050 is a `hidden beast` number, since 2 + 1 + 5 + 1 + 54 + 1 + 0 + 552 + 0 + 50 = 666.

It can be written as a sum of positive squares in 3 ways, for example, as 20694101551929 + 821309000121 = 4549077^2 + 906261^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21515410551996 and 21515410552014.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 23906011275 + ... + 23906012174.

Almost surely, 2^{21515410552050} is an apocalyptic number.

21515410552050 is an abundant number, since it is smaller than the sum of its proper divisors (36289325799000).

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

21515410552050 is a wasteful number, since it uses less digits than its factorization.

21515410552050 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47812023467 (or 47812023459 counting only the distinct ones).

The product of its (nonzero) digits is 50000, while the sum is 36.

The spelling of 21515410552050 in words is "twenty-one trillion, five hundred fifteen billion, four hundred ten million, five hundred fifty-two thousand, fifty".