40023401021 has 2 divisors, whose sum is σ = 40023401022. Its totient is φ = 40023401020.

The previous prime is 40023401003. The next prime is 40023401023. The reversal of 40023401021 is 12010432004.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31938693796 + 8084707225 = 178714^2 + 89915^2 .

It is a cyclic number.

It is not a de Polignac number, because 40023401021 - 2¹⁴ = 40023384637 is a prime.

Together with 40023401023, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40023401023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20011700510 + 20011700511.

It is an arithmetic number, because the mean of its divisors is an integer number (20011700511).

Almost surely, 2^40023401021 is an apocalyptic number.

It is an amenable number.

40023401021 is a deficient number, since it is larger than the sum of its proper divisors (1).

40023401021 is an equidigital number, since it uses as much as digits as its factorization.

40023401021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 192, while the sum is 17.

Adding to 40023401021 its reverse (12010432004), we get a palindrome (52033833025).

The spelling of 40023401021 in words is "forty billion, twenty-three million, four hundred one thousand, twenty-one".