21515041551033 has 16 divisors (see below), whose sum is σ = 31892012391040. Its totient is φ = 14335316492112.

The previous prime is 21515041551001. The next prime is 21515041551037. The reversal of 21515041551033 is 33015514051512.

21515041551033 is a `hidden beast` number, since 2 + 1 + 51 + 50 + 4 + 1 + 551 + 0 + 3 + 3 = 666.

It is not a de Polignac number, because 21515041551033 - 2⁵ = 21515041551001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21515041551037) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 223410466 + ... + 223506747.

It is an arithmetic number, because the mean of its divisors is an integer number (1993250774440).

Almost surely, 2^{21515041551033} is an apocalyptic number.

It is an amenable number.

21515041551033 is a deficient number, since it is larger than the sum of its proper divisors (10376970840007).

21515041551033 is a wasteful number, since it uses less digits than its factorization.

21515041551033 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 446919005 (or 446918999 counting only the distinct ones).

The product of its (nonzero) digits is 45000, while the sum is 36.

The spelling of 21515041551033 in words is "twenty-one trillion, five hundred fifteen billion, forty-one million, five hundred fifty-one thousand, thirty-three".