21369794794 has 4 divisors (see below), whose sum is σ = 32054692194. Its totient is φ = 10684897396.

The previous prime is 21369794791. The next prime is 21369794807. The reversal of 21369794794 is 49749796312.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 17430600625 + 3939194169 = 132025^2 + 62763^2 .

It is not an unprimeable number, because it can be changed into a prime (21369794791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5342448697 + ... + 5342448700.

Almost surely, 2^21369794794 is an apocalyptic number.

21369794794 is a deficient number, since it is larger than the sum of its proper divisors (10684897400).

21369794794 is a wasteful number, since it uses less digits than its factorization.

21369794794 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10684897399.

The product of its digits is 20575296, while the sum is 61.

The spelling of 21369794794 in words is "twenty-one billion, three hundred sixty-nine million, seven hundred ninety-four thousand, seven hundred ninety-four".