990021001311221 has 8 divisors (see below), whose sum is σ = 1103002121384064. Its totient is φ = 880869749715520.

The previous prime is 990021001311161. The next prime is 990021001311269. The reversal of 990021001311221 is 122113100120099.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-990021001311221 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (990021001310221) 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, 957467118740 + ... + 957467119773.

It is an arithmetic number, because the mean of its divisors is an integer number (137875265173008).

Almost surely, 2^{990021001311221} is an apocalyptic number.

It is an amenable number.

990021001311221 is a deficient number, since it is larger than the sum of its proper divisors (112981120072843).

990021001311221 is a wasteful number, since it uses less digits than its factorization.

990021001311221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1914934238571.

The product of its (nonzero) digits is 1944, while the sum is 32.

The spelling of 990021001311221 in words is "nine hundred ninety trillion, twenty-one billion, one million, three hundred eleven thousand, two hundred twenty-one".