21122515152 has 200 divisors, whose sum is σ = 65154329856. Its totient is φ = 6590985984.

The previous prime is 21122515151. The next prime is 21122515153. The reversal of 21122515152 is 25151522112.

21122515152 is a `hidden beast` number, since 21 + 122 + 5 + 1 + 515 + 2 = 666.

It is an interprime number because it is at equal distance from previous prime (21122515151) and next prime (21122515153).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21122515151) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 1393438 + ... + 1408514.

Almost surely, 2^21122515152 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 21122515152, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32577164928).

21122515152 is an abundant number, since it is smaller than the sum of its proper divisors (44031814704).

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

21122515152 is a wasteful number, since it uses less digits than its factorization.

21122515152 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15167 (or 15152 counting only the distinct ones).

The product of its digits is 2000, while the sum is 27.

The spelling of 21122515152 in words is "twenty-one billion, one hundred twenty-two million, five hundred fifteen thousand, one hundred fifty-two".