21533276160 has 432 divisors, whose sum is σ = 82074315960. Its totient is φ = 5217484800.

The previous prime is 21533276153. The next prime is 21533276179. The reversal of 21533276160 is 6167233512.

21533276160 is a `hidden beast` number, since 2 + 1 + 5 + 3 + 32 + 7 + 616 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 11150395 + ... + 11152325.

Almost surely, 2^21533276160 is an apocalyptic number.

21533276160 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 21533276160, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41037157980).

21533276160 is an abundant number, since it is smaller than the sum of its proper divisors (60541039800).

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

21533276160 is a wasteful number, since it uses less digits than its factorization.

21533276160 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1986 (or 1952 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 36.

The spelling of 21533276160 in words is "twenty-one billion, five hundred thirty-three million, two hundred seventy-six thousand, one hundred sixty".