21393158949 has 12 divisors (see below), whose sum is σ = 31273534656. Its totient is φ = 14090272872.

The previous prime is 21393158947. The next prime is 21393158987. The reversal of 21393158949 is 94985139312.

21393158949 is a `hidden beast` number, since 2 + 13 + 9 + 3 + 1 + 589 + 49 = 666.

It is not a de Polignac number, because 21393158949 - 2¹ = 21393158947 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21393158895 and 21393158904.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21393158947) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14318637 + ... + 14320130.

It is an arithmetic number, because the mean of its divisors is an integer number (2606127888).

Almost surely, 2^21393158949 is an apocalyptic number.

It is an amenable number.

21393158949 is a deficient number, since it is larger than the sum of its proper divisors (9880375707).

21393158949 is a wasteful number, since it uses less digits than its factorization.

21393158949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28638856 (or 28638853 counting only the distinct ones).

The product of its digits is 2099520, while the sum is 54.

The spelling of 21393158949 in words is "twenty-one billion, three hundred ninety-three million, one hundred fifty-eight thousand, nine hundred forty-nine".