21150155052 has 192 divisors, whose sum is σ = 60370508800. Its totient is φ = 6363878400.

The previous prime is 21150155051. The next prime is 21150155063. The reversal of 21150155052 is 25055105112.

21150155052 is a `hidden beast` number, since 2 + 1 + 150 + 1 + 5 + 505 + 2 = 666.

It is a super-2 number, since 2×21150155052² (a number of 21 digits) contains 22 as substring.

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

It is not an unprimeable number, because it can be changed into a prime (21150155051) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 14203524 + ... + 14205012.

Almost surely, 2^21150155052 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 21150155052, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30185254400).

21150155052 is an abundant number, since it is smaller than the sum of its proper divisors (39220353748).

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

21150155052 is a wasteful number, since it uses less digits than its factorization.

21150155052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1733 (or 1725 counting only the distinct ones).

The product of its (nonzero) digits is 2500, while the sum is 27.

The spelling of 21150155052 in words is "twenty-one billion, one hundred fifty million, one hundred fifty-five thousand, fifty-two".