21342566516 has 24 divisors (see below), whose sum is σ = 37666174560. Its totient is φ = 10580998752.

The previous prime is 21342566489. The next prime is 21342566527. The reversal of 21342566516 is 61566524312.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 419051 + ... + 467213.

It is an arithmetic number, because the mean of its divisors is an integer number (1569423940).

Almost surely, 2^21342566516 is an apocalyptic number.

It is an amenable number.

21342566516 is a deficient number, since it is larger than the sum of its proper divisors (16323608044).

21342566516 is a wasteful number, since it uses less digits than its factorization.

21342566516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49103 (or 49101 counting only the distinct ones).

The product of its digits is 259200, while the sum is 41.

The spelling of 21342566516 in words is "twenty-one billion, three hundred forty-two million, five hundred sixty-six thousand, five hundred sixteen".