21197186996 has 48 divisors (see below), whose sum is σ = 37823385600. Its totient is φ = 10393067232.

The previous prime is 21197186993. The next prime is 21197187029. The reversal of 21197186996 is 69968179112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21197186993) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29481125 + ... + 29481843.

It is an arithmetic number, because the mean of its divisors is an integer number (787987200).

Almost surely, 2^21197186996 is an apocalyptic number.

It is an amenable number.

21197186996 is a deficient number, since it is larger than the sum of its proper divisors (16626198604).

21197186996 is a wasteful number, since it uses less digits than its factorization.

21197186996 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1428 (or 1426 counting only the distinct ones).

The product of its digits is 2939328, while the sum is 59.

The spelling of 21197186996 in words is "twenty-one billion, one hundred ninety-seven million, one hundred eighty-six thousand, nine hundred ninety-six".