40224436621 has 2 divisors, whose sum is σ = 40224436622. Its totient is φ = 40224436620.

The previous prime is 40224436591. The next prime is 40224436643. The reversal of 40224436621 is 12663442204.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24401564100 + 15822872521 = 156210^2 + 125789^2 .

It is a cyclic number.

It is not a de Polignac number, because 40224436621 - 2²³ = 40216048013 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40224436691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20112218310 + 20112218311.

It is an arithmetic number, because the mean of its divisors is an integer number (20112218311).

Almost surely, 2^40224436621 is an apocalyptic number.

It is an amenable number.

40224436621 is a deficient number, since it is larger than the sum of its proper divisors (1).

40224436621 is an equidigital number, since it uses as much as digits as its factorization.

40224436621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 55296, while the sum is 34.

Adding to 40224436621 its reverse (12663442204), we get a palindrome (52887878825).

The spelling of 40224436621 in words is "forty billion, two hundred twenty-four million, four hundred thirty-six thousand, six hundred twenty-one".