40064200021 has 2 divisors, whose sum is σ = 40064200022. Its totient is φ = 40064200020.

The previous prime is 40064200009. The next prime is 40064200073. The reversal of 40064200021 is 12000246004.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26511980625 + 13552219396 = 162825^2 + 116414^2 .

It is a cyclic number.

It is not a de Polignac number, because 40064200021 - 2⁷ = 40064199893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40064200091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20032100010 + 20032100011.

It is an arithmetic number, because the mean of its divisors is an integer number (20032100011).

Almost surely, 2^40064200021 is an apocalyptic number.

It is an amenable number.

40064200021 is a deficient number, since it is larger than the sum of its proper divisors (1).

40064200021 is an equidigital number, since it uses as much as digits as its factorization.

40064200021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 384, while the sum is 19.

Adding to 40064200021 its reverse (12000246004), we get a palindrome (52064446025).

The spelling of 40064200021 in words is "forty billion, sixty-four million, two hundred thousand, twenty-one".