21164626288 has 80 divisors (see below), whose sum is σ = 45084114432. Its totient is φ = 9565920000.

The previous prime is 21164626237. The next prime is 21164626291. The reversal of 21164626288 is 88262646112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2225223 + ... + 2234713.

Almost surely, 2^21164626288 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21164626288, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22542057216).

21164626288 is an abundant number, since it is smaller than the sum of its proper divisors (23919488144).

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

21164626288 is a wasteful number, since it uses less digits than its factorization.

21164626288 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9734 (or 9728 counting only the distinct ones).

The product of its digits is 442368, while the sum is 46.

The spelling of 21164626288 in words is "twenty-one billion, one hundred sixty-four million, six hundred twenty-six thousand, two hundred eighty-eight".