40131204221 has 4 divisors (see below), whose sum is σ = 40217881152. Its totient is φ = 40044527292.

The previous prime is 40131204203. The next prime is 40131204227. The reversal of 40131204221 is 12240213104.

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 40131204221 - 2²² = 40127009917 is a prime.

It is a super-2 number, since 2×40131204221² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 40131204193 and 40131204202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40131204227) 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, 43337771 + ... + 43338696.

It is an arithmetic number, because the mean of its divisors is an integer number (10054470288).

Almost surely, 2^40131204221 is an apocalyptic number.

It is an amenable number.

40131204221 is a deficient number, since it is larger than the sum of its proper divisors (86676931).

40131204221 is an equidigital number, since it uses as much as digits as its factorization.

40131204221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86676930.

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 40131204221 its reverse (12240213104), we get a palindrome (52371417325).

The spelling of 40131204221 in words is "forty billion, one hundred thirty-one million, two hundred four thousand, two hundred twenty-one".