40556210621 has 4 divisors (see below), whose sum is σ = 40557414972. Its totient is φ = 40555006272.

The previous prime is 40556210603. The next prime is 40556210663. The reversal of 40556210621 is 12601265504.

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 4666802596 + 35889408025 = 68314^2 + 189445^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40556210621 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40556210521) 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, 550166 + ... + 619511.

It is an arithmetic number, because the mean of its divisors is an integer number (10139353743).

Almost surely, 2^40556210621 is an apocalyptic number.

It is an amenable number.

40556210621 is a deficient number, since it is larger than the sum of its proper divisors (1204351).

40556210621 is a wasteful number, since it uses less digits than its factorization.

40556210621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1204350.

The product of its (nonzero) digits is 14400, while the sum is 32.

The spelling of 40556210621 in words is "forty billion, five hundred fifty-six million, two hundred ten thousand, six hundred twenty-one".