21113971704 has 64 divisors (see below), whose sum is σ = 67028486400. Its totient is φ = 6032562912.

The previous prime is 21113971651. The next prime is 21113971709. The reversal of 21113971704 is 40717931112.

It is a super-2 number, since 2×21113971704² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21113971709) 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, 6980622 + ... + 6983645.

It is an arithmetic number, because the mean of its divisors is an integer number (1047320100).

Almost surely, 2^21113971704 is an apocalyptic number.

21113971704 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21113971704 is an abundant number, since it is smaller than the sum of its proper divisors (45914514696).

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

21113971704 is a wasteful number, since it uses less digits than its factorization.

21113971704 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13964289 (or 13964279 counting only the distinct ones).

The product of its (nonzero) digits is 10584, while the sum is 36.

The spelling of 21113971704 in words is "twenty-one billion, one hundred thirteen million, nine hundred seventy-one thousand, seven hundred four".