21160542533 has 4 divisors (see below), whose sum is σ = 22788276588. Its totient is φ = 19532808480.

The previous prime is 21160542511. The next prime is 21160542577. The reversal of 21160542533 is 33524506112.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2195672164 + 18964870369 = 46858^2 + 137713^2 .

It is a cyclic number.

It is not a de Polignac number, because 21160542533 - 2²² = 21156348229 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21160542533.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21160542503) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 813867008 + ... + 813867033.

It is an arithmetic number, because the mean of its divisors is an integer number (5697069147).

Almost surely, 2^21160542533 is an apocalyptic number.

It is an amenable number.

21160542533 is a deficient number, since it is larger than the sum of its proper divisors (1627734055).

21160542533 is a wasteful number, since it uses less digits than its factorization.

21160542533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1627734054.

The product of its (nonzero) digits is 21600, while the sum is 32.

The spelling of 21160542533 in words is "twenty-one billion, one hundred sixty million, five hundred forty-two thousand, five hundred thirty-three".