9122421990 has 64 divisors (see below), whose sum is σ = 23897970432. Its totient is φ = 2210217600.

The previous prime is 9122421983. The next prime is 9122422073. The reversal of 9122421990 is 991242219.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 644085 + ... + 658095.

It is an arithmetic number, because the mean of its divisors is an integer number (373405788).

Almost surely, 2^9122421990 is an apocalyptic number.

9122421990 is an abundant number, since it is smaller than the sum of its proper divisors (14775548442).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

9122421990 is a wasteful number, since it uses less digits than its factorization.

9122421990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16005.

The product of its (nonzero) digits is 23328, while the sum is 39.

The square root of 9122421990 is about 95511.3709984314. The cubic root of 9122421990 is about 2089.4727873584.

The spelling of 9122421990 in words is "nine billion, one hundred twenty-two million, four hundred twenty-one thousand, nine hundred ninety".