21152554533 has 48 divisors (see below), whose sum is σ = 34123602240. Its totient is φ = 12518496000.

The previous prime is 21152554519. The next prime is 21152554537. The reversal of 21152554533 is 33545525112.

21152554533 is a `hidden beast` number, since 2 + 1 + 1 + 52 + 554 + 53 + 3 = 666.

It is not a de Polignac number, because 21152554533 - 2⁹ = 21152554021 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21152554537) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 715438 + ... + 744416.

It is an arithmetic number, because the mean of its divisors is an integer number (710908380).

Almost surely, 2^21152554533 is an apocalyptic number.

It is an amenable number.

21152554533 is a deficient number, since it is larger than the sum of its proper divisors (12971047707).

21152554533 is a wasteful number, since it uses less digits than its factorization.

21152554533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29170 (or 29167 counting only the distinct ones).

The product of its digits is 90000, while the sum is 36.

The spelling of 21152554533 in words is "twenty-one billion, one hundred fifty-two million, five hundred fifty-four thousand, five hundred thirty-three".