21430087516 has 6 divisors (see below), whose sum is σ = 37502653160. Its totient is φ = 10715043756.

The previous prime is 21430087499. The next prime is 21430087531. The reversal of 21430087516 is 61578003412.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2678760936 + ... + 2678760943.

Almost surely, 2^21430087516 is an apocalyptic number.

It is an amenable number.

21430087516 is a deficient number, since it is larger than the sum of its proper divisors (16072565644).

21430087516 is a wasteful number, since it uses less digits than its factorization.

21430087516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5357521883 (or 5357521881 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 37.

The spelling of 21430087516 in words is "twenty-one billion, four hundred thirty million, eighty-seven thousand, five hundred sixteen".