21793681121 has 32 divisors (see below), whose sum is σ = 23181659136. Its totient is φ = 20468160000.

The previous prime is 21793681109. The next prime is 21793681127. The reversal of 21793681121 is 12118639712.

It is a cyclic number.

It is not a de Polignac number, because 21793681121 - 2⁶ = 21793681057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21793681127) 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, 21137876 + ... + 21138906.

It is an arithmetic number, because the mean of its divisors is an integer number (724426848).

Almost surely, 2^21793681121 is an apocalyptic number.

It is an amenable number.

21793681121 is a deficient number, since it is larger than the sum of its proper divisors (1387978015).

21793681121 is a wasteful number, since it uses less digits than its factorization.

21793681121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1313.

The product of its digits is 36288, while the sum is 41.

The spelling of 21793681121 in words is "twenty-one billion, seven hundred ninety-three million, six hundred eighty-one thousand, one hundred twenty-one".