21746984804 has 12 divisors (see below), whose sum is σ = 38775284604. Its totient is φ = 10668332064.

The previous prime is 21746984797. The next prime is 21746984807. The reversal of 21746984804 is 40848964712.

It can be written as a sum of positive squares in 2 ways, for example, as 12894056704 + 8852928100 = 113552^2 + 94090^2 .

It is a Harshad number since it is a multiple of its sum of digits (53).

It is not an unprimeable number, because it can be changed into a prime (21746984807) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 51289847 + ... + 51290270.

It is an arithmetic number, because the mean of its divisors is an integer number (3231273717).

Almost surely, 2^21746984804 is an apocalyptic number.

It is an amenable number.

21746984804 is a deficient number, since it is larger than the sum of its proper divisors (17028299800).

21746984804 is a wasteful number, since it uses less digits than its factorization.

21746984804 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102580174 (or 102580172 counting only the distinct ones).

The product of its (nonzero) digits is 3096576, while the sum is 53.

The spelling of 21746984804 in words is "twenty-one billion, seven hundred forty-six million, nine hundred eighty-four thousand, eight hundred four".