21115031540052 has 12 divisors (see below), whose sum is σ = 49268406926816. Its totient is φ = 7038343846680.

The previous prime is 21115031540017. The next prime is 21115031540081. The reversal of 21115031540052 is 25004513051112.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

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, 879792980824 + ... + 879792980847.

Almost surely, 2^{21115031540052} is an apocalyptic number.

It is an amenable number.

21115031540052 is an abundant number, since it is smaller than the sum of its proper divisors (28153375386764).

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

21115031540052 is a wasteful number, since it uses less digits than its factorization.

21115031540052 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1759585961678 (or 1759585961676 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 30.

Adding to 21115031540052 its reverse (25004513051112), we get a palindrome (46119544591164).

The spelling of 21115031540052 in words is "twenty-one trillion, one hundred fifteen billion, thirty-one million, five hundred forty thousand, fifty-two".