40631006821 has 4 divisors (see below), whose sum is σ = 40735457100. Its totient is φ = 40526556544.

The previous prime is 40631006783. The next prime is 40631006833. The reversal of 40631006821 is 12860013604.

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 3705156900 + 36925849921 = 60870^2 + 192161^2 .

It is a cyclic number.

It is not a de Polignac number, because 40631006821 - 2¹¹ = 40631004773 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 (40631006861) 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, 52224556 + ... + 52225333.

It is an arithmetic number, because the mean of its divisors is an integer number (10183864275).

Almost surely, 2^40631006821 is an apocalyptic number.

It is an amenable number.

40631006821 is a deficient number, since it is larger than the sum of its proper divisors (104450279).

40631006821 is a wasteful number, since it uses less digits than its factorization.

40631006821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104450278.

The product of its (nonzero) digits is 6912, while the sum is 31.

The spelling of 40631006821 in words is "forty billion, six hundred thirty-one million, six thousand, eight hundred twenty-one".