21153500160 has 528 divisors, whose sum is σ = 76058987040. Its totient is φ = 5009571840.

The previous prime is 21153500119. The next prime is 21153500171. The reversal of 21153500160 is 6100535112.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 21153500160.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 75279220 + ... + 75279500.

Almost surely, 2^21153500160 is an apocalyptic number.

21153500160 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 21153500160, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38029493520).

21153500160 is an abundant number, since it is smaller than the sum of its proper divisors (54905486880).

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

21153500160 is a wasteful number, since it uses less digits than its factorization.

21153500160 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 364 (or 333 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 24.

The spelling of 21153500160 in words is "twenty-one billion, one hundred fifty-three million, five hundred thousand, one hundred sixty".