21793348881 has 48 divisors (see below), whose sum is σ = 33374140800. Its totient is φ = 13680285696.

The previous prime is 21793348877. The next prime is 21793348891. The reversal of 21793348881 is 18884339712.

It is a happy number.

21793348881 is a `hidden beast` number, since 217 + 9 + 3 + 348 + 8 + 81 = 666.

It is not a de Polignac number, because 21793348881 - 2² = 21793348877 is a prime.

It is a super-2 number, since 2×21793348881² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21793348891) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 10312881 + ... + 10314993.

It is an arithmetic number, because the mean of its divisors is an integer number (695294600).

Almost surely, 2^21793348881 is an apocalyptic number.

It is an amenable number.

21793348881 is a deficient number, since it is larger than the sum of its proper divisors (11580791919).

21793348881 is a wasteful number, since it uses less digits than its factorization.

21793348881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3110 (or 3107 counting only the distinct ones).

The product of its digits is 2322432, while the sum is 54.

The spelling of 21793348881 in words is "twenty-one billion, seven hundred ninety-three million, three hundred forty-eight thousand, eight hundred eighty-one".