21214017516 has 48 divisors (see below), whose sum is σ = 49916174336. Its totient is φ = 7011857664.

The previous prime is 21214017479. The next prime is 21214017523. The reversal of 21214017516 is 61571041212.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4900545 + ... + 4904871.

Almost surely, 2^21214017516 is an apocalyptic number.

It is an amenable number.

21214017516 is an abundant number, since it is smaller than the sum of its proper divisors (28702156820).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21214017516 is a wasteful number, since it uses less digits than its factorization.

21214017516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7678 (or 7676 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 30.

Adding to 21214017516 its reverse (61571041212), we get a palindrome (82785058728).

The spelling of 21214017516 in words is "twenty-one billion, two hundred fourteen million, seventeen thousand, five hundred sixteen".