40120606921 has 2 divisors, whose sum is σ = 40120606922. Its totient is φ = 40120606920.

The previous prime is 40120606913. The next prime is 40120606961. The reversal of 40120606921 is 12960602104.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 35659034896 + 4461572025 = 188836^2 + 66795^2 .

It is a cyclic number.

It is not a de Polignac number, because 40120606921 - 2³ = 40120606913 is a prime.

It is not a weakly prime, because it can be changed into another prime (40120606961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20060303460 + 20060303461.

It is an arithmetic number, because the mean of its divisors is an integer number (20060303461).

Almost surely, 2^40120606921 is an apocalyptic number.

It is an amenable number.

40120606921 is a deficient number, since it is larger than the sum of its proper divisors (1).

40120606921 is an equidigital number, since it uses as much as digits as its factorization.

40120606921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 31.

The spelling of 40120606921 in words is "forty billion, one hundred twenty million, six hundred six thousand, nine hundred twenty-one".