9900991210 has 32 divisors (see below), whose sum is σ = 20112364800. Its totient is φ = 3476208960.

The previous prime is 9900991207. The next prime is 9900991211. The reversal of 9900991210 is 121990099.

It is not an unprimeable number, because it can be changed into a prime (9900991211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1548690 + ... + 1555069.

It is an arithmetic number, because the mean of its divisors is an integer number (628511400).

Almost surely, 2^9900991210 is an apocalyptic number.

9900991210 is an abundant number, since it is smaller than the sum of its proper divisors (10211373590).

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

9900991210 is a wasteful number, since it uses less digits than its factorization.

9900991210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3103806.

The product of its (nonzero) digits is 13122, while the sum is 40.

The square root of 9900991210 is about 99503.7246036549. The cubic root of 9900991210 is about 2147.3008284128.

The spelling of 9900991210 in words is "nine billion, nine hundred million, nine hundred ninety-one thousand, two hundred ten".