21520734537033 has 12 divisors (see below), whose sum is σ = 31147305658560. Its totient is φ = 14318633181336.

The previous prime is 21520734536989. The next prime is 21520734537077. The reversal of 21520734537033 is 33073543702512.

21520734537033 is a `hidden beast` number, since 2 + 1 + 5 + 207 + 3 + 45 + 370 + 33 = 666.

It is an interprime number because it is at equal distance from previous prime (21520734536989) and next prime (21520734537077).

It is not a de Polignac number, because 21520734537033 - 2¹⁰ = 21520734536009 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21520734537033.

It is not an unprimeable number, because it can be changed into a prime (21520734537733) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2376926613 + ... + 2376935666.

It is an arithmetic number, because the mean of its divisors is an integer number (2595608804880).

Almost surely, 2^{21520734537033} is an apocalyptic number.

It is an amenable number.

21520734537033 is a deficient number, since it is larger than the sum of its proper divisors (9626571121527).

21520734537033 is a wasteful number, since it uses less digits than its factorization.

21520734537033 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4753862788 (or 4753862785 counting only the distinct ones).

The product of its (nonzero) digits is 1587600, while the sum is 45.

The spelling of 21520734537033 in words is "twenty-one trillion, five hundred twenty billion, seven hundred thirty-four million, five hundred thirty-seven thousand, thirty-three".