40020634421 has 4 divisors (see below), whose sum is σ = 40054351392. Its totient is φ = 39986917452.

The previous prime is 40020634393. The next prime is 40020634463. The reversal of 40020634421 is 12443602004.

40020634421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 40020634421 - 2¹⁴ = 40020618037 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 (40020634471) 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, 16856705 + ... + 16859078.

It is an arithmetic number, because the mean of its divisors is an integer number (10013587848).

Almost surely, 2^40020634421 is an apocalyptic number.

It is an amenable number.

40020634421 is a deficient number, since it is larger than the sum of its proper divisors (33716971).

40020634421 is a wasteful number, since it uses less digits than its factorization.

40020634421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33716970.

The product of its (nonzero) digits is 4608, while the sum is 26.

The spelling of 40020634421 in words is "forty billion, twenty million, six hundred thirty-four thousand, four hundred twenty-one".