40340120421 has 4 divisors (see below), whose sum is σ = 53786827232. Its totient is φ = 26893413612.

The previous prime is 40340120419. The next prime is 40340120459. The reversal of 40340120421 is 12402104304.

40340120421 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 not a de Polignac number, because 40340120421 - 2¹ = 40340120419 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 (40340120411) 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, 6723353401 + ... + 6723353406.

It is an arithmetic number, because the mean of its divisors is an integer number (13446706808).

Almost surely, 2^40340120421 is an apocalyptic number.

It is an amenable number.

40340120421 is a deficient number, since it is larger than the sum of its proper divisors (13446706811).

40340120421 is a wasteful number, since it uses less digits than its factorization.

40340120421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13446706810.

The product of its (nonzero) digits is 768, while the sum is 21.

Adding to 40340120421 its reverse (12402104304), we get a palindrome (52742224725).

The spelling of 40340120421 in words is "forty billion, three hundred forty million, one hundred twenty thousand, four hundred twenty-one".