40021222009 has 2 divisors, whose sum is σ = 40021222010. Its totient is φ = 40021222008.

The previous prime is 40021221983. The next prime is 40021222039. The reversal of 40021222009 is 90022212004.

40021222009 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 38810182009 + 1211040000 = 197003^2 + 34800^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40021222009 is a prime.

It is a super-2 number, since 2×40021222009² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (40021222039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20010611004 + 20010611005.

It is an arithmetic number, because the mean of its divisors is an integer number (20010611005).

Almost surely, 2^40021222009 is an apocalyptic number.

It is an amenable number.

40021222009 is a deficient number, since it is larger than the sum of its proper divisors (1).

40021222009 is an equidigital number, since it uses as much as digits as its factorization.

40021222009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 22.

The spelling of 40021222009 in words is "forty billion, twenty-one million, two hundred twenty-two thousand, nine".