40125422021 has 4 divisors (see below), whose sum is σ = 40212462444. Its totient is φ = 40038381600.

The previous prime is 40125422017. The next prime is 40125422027. The reversal of 40125422021 is 12022452104.

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 14342697121 + 25782724900 = 119761^2 + 160570^2 .

It is a cyclic number.

It is not a de Polignac number, because 40125422021 - 2² = 40125422017 is a prime.

It is a super-2 number, since 2×40125422021² (a number of 22 digits) 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 (40125422027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43519520 + ... + 43520441.

It is an arithmetic number, because the mean of its divisors is an integer number (10053115611).

Almost surely, 2^40125422021 is an apocalyptic number.

It is an amenable number.

40125422021 is a deficient number, since it is larger than the sum of its proper divisors (87040423).

40125422021 is an equidigital number, since it uses as much as digits as its factorization.

40125422021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87040422.

The product of its (nonzero) digits is 1280, while the sum is 23.

Adding to 40125422021 its reverse (12022452104), we get a palindrome (52147874125).

The spelling of 40125422021 in words is "forty billion, one hundred twenty-five million, four hundred twenty-two thousand, twenty-one".