40125421 has 4 divisors (see below), whose sum is σ = 45857632. Its totient is φ = 34393212.

The previous prime is 40125419. The next prime is 40125469. The reversal of 40125421 is 12452104.

40125421 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 40125421 - 2¹ = 40125419 is a prime.

It is a super-2 number, since 2×40125421² = 3220098820854482, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40125521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2866095 + ... + 2866108.

It is an arithmetic number, because the mean of its divisors is an integer number (11464408).

Almost surely, 2^40125421 is an apocalyptic number.

It is an amenable number.

40125421 is a deficient number, since it is larger than the sum of its proper divisors (5732211).

40125421 is an equidigital number, since it uses as much as digits as its factorization.

40125421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5732210.

The product of its (nonzero) digits is 320, while the sum is 19.

The square root of 40125421 is about 6334.4629606621. The cubic root of 40125421 is about 342.3522612144.

Adding to 40125421 its reverse (12452104), we get a palindrome (52577525).

The spelling of 40125421 in words is "forty million, one hundred twenty-five thousand, four hundred twenty-one".