10100991820 has 24 divisors (see below), whose sum is σ = 21422107728. Its totient is φ = 4000392000.

The previous prime is 10100991787. The next prime is 10100991829. The reversal of 10100991820 is 2819900101.

It is not an unprimeable number, because it can be changed into a prime (10100991829) 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, 2498226 + ... + 2502265.

It is an arithmetic number, because the mean of its divisors is an integer number (892587822).

Almost surely, 2^10100991820 is an apocalyptic number.

10100991820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

10100991820 is an abundant number, since it is smaller than the sum of its proper divisors (11321115908).

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

10100991820 is a wasteful number, since it uses less digits than its factorization.

10100991820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5000601 (or 5000599 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 31.

The spelling of 10100991820 in words is "ten billion, one hundred million, nine hundred ninety-one thousand, eight hundred twenty".