21515410552113 has 24 divisors (see below), whose sum is σ = 31167649367400. Its totient is φ = 14302147207680.

The previous prime is 21515410552091. The next prime is 21515410552133. The reversal of 21515410552113 is 31125501451512.

21515410552113 is a `hidden beast` number, since 2 + 1 + 5 + 15 + 4 + 105 + 521 + 13 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 11227270906944 + 10288139645169 = 3350712^2 + 3207513^2 .

It is not a de Polignac number, because 21515410552113 - 2¹⁷ = 21515410421041 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21515410552133) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 193684495 + ... + 193795547.

It is an arithmetic number, because the mean of its divisors is an integer number (1298652056975).

Almost surely, 2^{21515410552113} is an apocalyptic number.

It is an amenable number.

21515410552113 is a deficient number, since it is larger than the sum of its proper divisors (9652238815287).

21515410552113 is a wasteful number, since it uses less digits than its factorization.

21515410552113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173089 (or 173086 counting only the distinct ones).

The product of its (nonzero) digits is 30000, while the sum is 36.

The spelling of 21515410552113 in words is "twenty-one trillion, five hundred fifteen billion, four hundred ten million, five hundred fifty-two thousand, one hundred thirteen".