21513513850402 has 8 divisors (see below), whose sum is σ = 36880309457856. Its totient is φ = 9220077364452.

The previous prime is 21513513850391. The next prime is 21513513850459. The reversal of 21513513850402 is 20405831531512.

It is a sphenic number, since it is the product of 3 distinct primes.

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, 768339780358 + ... + 768339780385.

It is an arithmetic number, because the mean of its divisors is an integer number (4610038682232).

Almost surely, 2^{21513513850402} is an apocalyptic number.

21513513850402 is a deficient number, since it is larger than the sum of its proper divisors (15366795607454).

21513513850402 is a wasteful number, since it uses less digits than its factorization.

21513513850402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1536679560752.

The product of its (nonzero) digits is 144000, while the sum is 40.

The spelling of 21513513850402 in words is "twenty-one trillion, five hundred thirteen billion, five hundred thirteen million, eight hundred fifty thousand, four hundred two".