21611050552 has 48 divisors (see below), whose sum is σ = 50762232360. Its totient is φ = 8549424576.

The previous prime is 21611050519. The next prime is 21611050583. The reversal of 21611050552 is 25505011612.

It is a super-2 number, since 2×21611050552² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a self number, because there is not a number n which added to its sum of digits gives 21611050552.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2115298 + ... + 2125489.

Almost surely, 2^21611050552 is an apocalyptic number.

It is an amenable number.

21611050552 is an abundant number, since it is smaller than the sum of its proper divisors (29151181808).

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

21611050552 is a wasteful number, since it uses less digits than its factorization.

21611050552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4240820 (or 4240809 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 28.

It can be divided in two parts, 216110 and 50552, that added together give a palindrome (266662).

The spelling of 21611050552 in words is "twenty-one billion, six hundred eleven million, fifty thousand, five hundred fifty-two".