21516517102 has 8 divisors (see below), whose sum is σ = 32443754112. Its totient is φ = 10701932400.

The previous prime is 21516517049. The next prime is 21516517147. The reversal of 21516517102 is 20171561512.

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

It is a congruent number.

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, 28162599 + ... + 28163362.

It is an arithmetic number, because the mean of its divisors is an integer number (4055469264).

Almost surely, 2^21516517102 is an apocalyptic number.

21516517102 is a deficient number, since it is larger than the sum of its proper divisors (10927237010).

21516517102 is a wasteful number, since it uses less digits than its factorization.

21516517102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56326154.

The product of its (nonzero) digits is 4200, while the sum is 31.

The spelling of 21516517102 in words is "twenty-one billion, five hundred sixteen million, five hundred seventeen thousand, one hundred two".