21552288837 has 8 divisors (see below), whose sum is σ = 28737080736. Its totient is φ = 14367844752.

The previous prime is 21552288833. The next prime is 21552288847. The reversal of 21552288837 is 73888225512.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21552288837 - 2² = 21552288833 is a prime.

It is a super-2 number, since 2×21552288837² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21552288837.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21552288833) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 149463 + ... + 255819.

It is an arithmetic number, because the mean of its divisors is an integer number (3592135092).

Almost surely, 2^21552288837 is an apocalyptic number.

It is an amenable number.

21552288837 is a deficient number, since it is larger than the sum of its proper divisors (7184791899).

21552288837 is a wasteful number, since it uses less digits than its factorization.

21552288837 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173907.

The product of its digits is 2150400, while the sum is 51.

The spelling of 21552288837 in words is "twenty-one billion, five hundred fifty-two million, two hundred eighty-eight thousand, eight hundred thirty-seven".