21102514512 has 40 divisors (see below), whose sum is σ = 55076849856. Its totient is φ = 6961652736.

The previous prime is 21102514441. The next prime is 21102514519. The reversal of 21102514512 is 21541520112.

It is a happy number.

It is a super-2 number, since 2×21102514512² (a number of 21 digits) contains 22 as substring.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21102514519) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2261508 + ... + 2270819.

Almost surely, 2^21102514512 is an apocalyptic number.

It is an amenable number.

21102514512 is an abundant number, since it is smaller than the sum of its proper divisors (33974335344).

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

21102514512 is a wasteful number, since it uses less digits than its factorization.

21102514512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4532435 (or 4532429 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 24.

The spelling of 21102514512 in words is "twenty-one billion, one hundred two million, five hundred fourteen thousand, five hundred twelve".