21502434513 has 16 divisors (see below), whose sum is σ = 34693004160. Its totient is φ = 11564334336.

The previous prime is 21502434493. The next prime is 21502434521. The reversal of 21502434513 is 31543420512.

It is not a de Polignac number, because 21502434513 - 2¹⁰ = 21502433489 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21502434533) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30115098 + ... + 30115811.

It is an arithmetic number, because the mean of its divisors is an integer number (2168312760).

Almost surely, 2^21502434513 is an apocalyptic number.

It is an amenable number.

21502434513 is a deficient number, since it is larger than the sum of its proper divisors (13190569647).

21502434513 is a wasteful number, since it uses less digits than its factorization.

21502434513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60230936.

The product of its (nonzero) digits is 14400, while the sum is 30.

The spelling of 21502434513 in words is "twenty-one billion, five hundred two million, four hundred thirty-four thousand, five hundred thirteen".