990021011 has 32 divisors (see below), whose sum is σ = 1216427520. Its totient is φ = 786931200.

The previous prime is 990021001. The next prime is 990021017. The reversal of 990021011 is 110120099.

It is a cyclic number.

It is not a de Polignac number, because 990021011 - 2¹⁴ = 990004627 is a prime.

It is not an unprimeable number, because it can be changed into a prime (990021017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2147321 + ... + 2147781.

It is an arithmetic number, because the mean of its divisors is an integer number (38013360).

Almost surely, 2^990021011 is an apocalyptic number.

990021011 is a deficient number, since it is larger than the sum of its proper divisors (226406509).

990021011 is a wasteful number, since it uses less digits than its factorization.

990021011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 795.

The product of its (nonzero) digits is 162, while the sum is 23.

The square root of 990021011 is about 31464.5993300407. The cubic root of 990021011 is about 996.6625441131.

The spelling of 990021011 in words is "nine hundred ninety million, twenty-one thousand, eleven".