21113344197 has 32 divisors (see below), whose sum is σ = 34331996160. Its totient is φ = 12717434160.

The previous prime is 21113344181. The next prime is 21113344249. The reversal of 21113344197 is 79144331112.

It is a happy number.

21113344197 is a `hidden beast` number, since 211 + 13 + 344 + 1 + 97 = 666.

It is not a de Polignac number, because 21113344197 - 2⁴ = 21113344181 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21113344177) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 169653 + ... + 266474.

It is an arithmetic number, because the mean of its divisors is an integer number (1072874880).

Almost surely, 2^21113344197 is an apocalyptic number.

21113344197 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

21113344197 is a deficient number, since it is larger than the sum of its proper divisors (13218651963).

21113344197 is a wasteful number, since it uses less digits than its factorization.

21113344197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 436310 (or 436304 counting only the distinct ones).

The product of its digits is 18144, while the sum is 36.

The spelling of 21113344197 in words is "twenty-one billion, one hundred thirteen million, three hundred forty-four thousand, one hundred ninety-seven".