90212221012 has 24 divisors (see below), whose sum is σ = 167430704616. Its totient is φ = 42383536128.

The previous prime is 90212221003. The next prime is 90212221013. The reversal of 90212221012 is 21012221209.

It can be written as a sum of positive squares in 4 ways, for example, as 9911397136 + 80300823876 = 99556^2 + 283374^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90212221013) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1040413 + ... + 1123780.

It is an arithmetic number, because the mean of its divisors is an integer number (6976279359).

Almost surely, 2^90212221012 is an apocalyptic number.

It is an amenable number.

90212221012 is a deficient number, since it is larger than the sum of its proper divisors (77218483604).

90212221012 is a wasteful number, since it uses less digits than its factorization.

90212221012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2164827 (or 2164825 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 22.

The spelling of 90212221012 in words is "ninety billion, two hundred twelve million, two hundred twenty-one thousand, twelve".