21149197496 has 16 divisors (see below), whose sum is σ = 45319709040. Its totient is φ = 9063941760.

The previous prime is 21149197493. The next prime is 21149197523. The reversal of 21149197496 is 69479194112.

It is a happy number.

It is a Smith number, since the sum of its digits (53) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21149197493) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 188832065 + ... + 188832176.

It is an arithmetic number, because the mean of its divisors is an integer number (2832481815).

Almost surely, 2^21149197496 is an apocalyptic number.

It is an amenable number.

21149197496 is an abundant number, since it is smaller than the sum of its proper divisors (24170511544).

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

21149197496 is a wasteful number, since it uses less digits than its factorization.

21149197496 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 377664254 (or 377664250 counting only the distinct ones).

The product of its digits is 979776, while the sum is 53.

The spelling of 21149197496 in words is "twenty-one billion, one hundred forty-nine million, one hundred ninety-seven thousand, four hundred ninety-six".