43826404621 has 2 divisors, whose sum is σ = 43826404622. Its totient is φ = 43826404620.

The previous prime is 43826404613. The next prime is 43826404627. The reversal of 43826404621 is 12640462834.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 35511518025 + 8314886596 = 188445^2 + 91186^2 .

It is a cyclic number.

It is not a de Polignac number, because 43826404621 - 2³ = 43826404613 is a prime.

It is a super-2 number, since 2×43826404621² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43826404627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21913202310 + 21913202311.

It is an arithmetic number, because the mean of its divisors is an integer number (21913202311).

Almost surely, 2^43826404621 is an apocalyptic number.

It is an amenable number.

43826404621 is a deficient number, since it is larger than the sum of its proper divisors (1).

43826404621 is an equidigital number, since it uses as much as digits as its factorization.

43826404621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 221184, while the sum is 40.

The spelling of 43826404621 in words is "forty-three billion, eight hundred twenty-six million, four hundred four thousand, six hundred twenty-one".