21150052560 has 1200 divisors, whose sum is σ = 94892497920. Its totient is φ = 4269957120.

The previous prime is 21150052519. The next prime is 21150052607. The reversal of 21150052560 is 6525005112.

21150052560 is a `hidden beast` number, since 2 + 1 + 1 + 50 + 0 + 52 + 560 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 239 ways as a sum of consecutive naturals, for example, 237640996 + ... + 237641084.

Almost surely, 2^21150052560 is an apocalyptic number.

21150052560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21150052560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (47446248960).

21150052560 is an abundant number, since it is smaller than the sum of its proper divisors (73742445360).

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

21150052560 is a wasteful number, since it uses less digits than its factorization.

21150052560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178 (or 150 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 27.

Adding to 21150052560 its reverse (6525005112), we get a palindrome (27675057672).

The spelling of 21150052560 in words is "twenty-one billion, one hundred fifty million, fifty-two thousand, five hundred sixty".