21977626045 has 4 divisors (see below), whose sum is σ = 26373151260. Its totient is φ = 17582100832.

The previous prime is 21977626039. The next prime is 21977626063. The reversal of 21977626045 is 54062677912.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 2427434361 + 19550191684 = 49269^2 + 139822^2 .

It is a cyclic number.

It is not a de Polignac number, because 21977626045 - 2¹³ = 21977617853 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 21977626045.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2197762600 + ... + 2197762609.

It is an arithmetic number, because the mean of its divisors is an integer number (6593287815).

Almost surely, 2^21977626045 is an apocalyptic number.

It is an amenable number.

21977626045 is a deficient number, since it is larger than the sum of its proper divisors (4395525215).

21977626045 is an equidigital number, since it uses as much as digits as its factorization.

21977626045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4395525214.

The product of its (nonzero) digits is 1270080, while the sum is 49.

The spelling of 21977626045 in words is "twenty-one billion, nine hundred seventy-seven million, six hundred twenty-six thousand, forty-five".