21330197516 has 12 divisors (see below), whose sum is σ = 38950795632. Its totient is φ = 10201398768.

The previous prime is 21330197501. The next prime is 21330197569. The reversal of 21330197516 is 61579103312.

It is a self number, because there is not a number n which added to its sum of digits gives 21330197516.

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, 115924895 + ... + 115925078.

It is an arithmetic number, because the mean of its divisors is an integer number (3245899636).

Almost surely, 2^21330197516 is an apocalyptic number.

It is an amenable number.

21330197516 is a deficient number, since it is larger than the sum of its proper divisors (17620598116).

21330197516 is a wasteful number, since it uses less digits than its factorization.

21330197516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 231850000 (or 231849998 counting only the distinct ones).

The product of its (nonzero) digits is 34020, while the sum is 38.

The spelling of 21330197516 in words is "twenty-one billion, three hundred thirty million, one hundred ninety-seven thousand, five hundred sixteen".