990221012112221 has 8 divisors (see below), whose sum is σ = 993081601405824. Its totient is φ = 987364524024000.

The previous prime is 990221012112203. The next prime is 990221012112301. The reversal of 990221012112221 is 122211210122099.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 990221012112221 - 2²⁶ = 990220945003357 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (990221012112721) 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, 1024817756 + ... + 1025783541.

It is an arithmetic number, because the mean of its divisors is an integer number (124135200175728).

Almost surely, 2^{990221012112221} is an apocalyptic number.

It is an amenable number.

990221012112221 is a deficient number, since it is larger than the sum of its proper divisors (2860589293603).

990221012112221 is a wasteful number, since it uses less digits than its factorization.

990221012112221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2050602691.

The product of its (nonzero) digits is 5184, while the sum is 35.

The spelling of 990221012112221 in words is "nine hundred ninety trillion, two hundred twenty-one billion, twelve million, one hundred twelve thousand, two hundred twenty-one".