43943924621 has 2 divisors, whose sum is σ = 43943924622. Its totient is φ = 43943924620.

The previous prime is 43943924551. The next prime is 43943924659. The reversal of 43943924621 is 12642934934.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 43906592521 + 37332100 = 209539^2 + 6110^2 .

It is a cyclic number.

It is not a de Polignac number, because 43943924621 - 2²⁶ = 43876815757 is a prime.

It is a super-2 number, since 2×43943924621² (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 (43943914621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21971962310 + 21971962311.

It is an arithmetic number, because the mean of its divisors is an integer number (21971962311).

Almost surely, 2^43943924621 is an apocalyptic number.

It is an amenable number.

43943924621 is a deficient number, since it is larger than the sum of its proper divisors (1).

43943924621 is an equidigital number, since it uses as much as digits as its factorization.

43943924621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1119744, while the sum is 47.

The spelling of 43943924621 in words is "forty-three billion, nine hundred forty-three million, nine hundred twenty-four thousand, six hundred twenty-one".