90012122201 has 4 divisors (see below), whose sum is σ = 90012858804. Its totient is φ = 90011385600.

The previous prime is 90012122173. The next prime is 90012122243. The reversal of 90012122201 is 10222121009.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 10222121009 = 31 ⋅329745839.

It can be written as a sum of positive squares in 2 ways, for example, as 74060179600 + 15951942601 = 272140^2 + 126301^2 .

It is a cyclic number.

It is not a de Polignac number, because 90012122201 - 2²⁶ = 89945013337 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90012124201) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 136280 + ... + 445641.

It is an arithmetic number, because the mean of its divisors is an integer number (22503214701).

Almost surely, 2^90012122201 is an apocalyptic number.

It is an amenable number.

90012122201 is a deficient number, since it is larger than the sum of its proper divisors (736603).

90012122201 is a wasteful number, since it uses less digits than its factorization.

90012122201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 736602.

The product of its (nonzero) digits is 144, while the sum is 20.

The spelling of 90012122201 in words is "ninety billion, twelve million, one hundred twenty-two thousand, two hundred one".