40421021161 has 4 divisors (see below), whose sum is σ = 40421533572. Its totient is φ = 40420508752.

The previous prime is 40421021101. The next prime is 40421021167. The reversal of 40421021161 is 16112012404.

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 22843299600 + 17577721561 = 151140^2 + 132581^2 .

It is a cyclic number.

It is not a de Polignac number, because 40421021161 - 2⁷ = 40421021033 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40421021167) 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, 110110 + ... + 304903.

It is an arithmetic number, because the mean of its divisors is an integer number (10105383393).

Almost surely, 2^40421021161 is an apocalyptic number.

It is an amenable number.

40421021161 is a deficient number, since it is larger than the sum of its proper divisors (512411).

40421021161 is an equidigital number, since it uses as much as digits as its factorization.

40421021161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 512410.

The product of its (nonzero) digits is 384, while the sum is 22.

Adding to 40421021161 its reverse (16112012404), we get a palindrome (56533033565).

The spelling of 40421021161 in words is "forty billion, four hundred twenty-one million, twenty-one thousand, one hundred sixty-one".