40402342121221 has 2 divisors, whose sum is σ = 40402342121222. Its totient is φ = 40402342121220.

The previous prime is 40402342121213. The next prime is 40402342121227. The reversal of 40402342121221 is 12212124320404.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 33587657976196 + 6814684145025 = 5795486^2 + 2610495^2 .

It is a cyclic number.

It is not a de Polignac number, because 40402342121221 - 2³ = 40402342121213 is a prime.

It is a super-2 number, since 2×40402342121221² (a number of 28 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 40402342121221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40402342121227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20201171060610 + 20201171060611.

It is an arithmetic number, because the mean of its divisors is an integer number (20201171060611).

Almost surely, 2^{40402342121221} is an apocalyptic number.

It is an amenable number.

40402342121221 is a deficient number, since it is larger than the sum of its proper divisors (1).

40402342121221 is an equidigital number, since it uses as much as digits as its factorization.

40402342121221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6144, while the sum is 28.

Adding to 40402342121221 its reverse (12212124320404), we get a palindrome (52614466441625).

The spelling of 40402342121221 in words is "forty trillion, four hundred two billion, three hundred forty-two million, one hundred twenty-one thousand, two hundred twenty-one".