21498897964 has 12 divisors (see below), whose sum is σ = 37968238000. Its totient is φ = 10650829968.

The previous prime is 21498897943. The next prime is 21498897991. The reversal of 21498897964 is 46979889412.

It is a super-2 number, since 2×21498897964² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21498897964.

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, 24654264 + ... + 24655135.

Almost surely, 2^21498897964 is an apocalyptic number.

It is an amenable number.

21498897964 is a deficient number, since it is larger than the sum of its proper divisors (16469340036).

21498897964 is a wasteful number, since it uses less digits than its factorization.

21498897964 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49309512 (or 49309510 counting only the distinct ones).

The product of its digits is 62705664, while the sum is 67.

The spelling of 21498897964 in words is "twenty-one billion, four hundred ninety-eight million, eight hundred ninety-seven thousand, nine hundred sixty-four".