21513501402312 has 16 divisors (see below), whose sum is σ = 53783753505840. Its totient is φ = 7171167134096.

The previous prime is 21513501402271. The next prime is 21513501402403. The reversal of 21513501402312 is 21320410531512.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 21513501402312.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 448197945858 + ... + 448197945905.

It is an arithmetic number, because the mean of its divisors is an integer number (3361484594115).

Almost surely, 2^{21513501402312} is an apocalyptic number.

It is an amenable number.

21513501402312 is an abundant number, since it is smaller than the sum of its proper divisors (32270252103528).

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

21513501402312 is a wasteful number, since it uses less digits than its factorization.

21513501402312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 896395891772 (or 896395891768 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 30.

Adding to 21513501402312 its reverse (21320410531512), we get a palindrome (42833911933824).

The spelling of 21513501402312 in words is "twenty-one trillion, five hundred thirteen billion, five hundred one million, four hundred two thousand, three hundred twelve".