21003110994 has 64 divisors (see below), whose sum is σ = 43468254720. Its totient is φ = 6761779200.

The previous prime is 21003110993. The next prime is 21003111011. The reversal of 21003110994 is 49901130012.

It is a super-2 number, since 2×21003110994² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21003110993) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10053102 + ... + 10055190.

It is an arithmetic number, because the mean of its divisors is an integer number (679191480).

Almost surely, 2^21003110994 is an apocalyptic number.

21003110994 is an abundant number, since it is smaller than the sum of its proper divisors (22465143726).

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

21003110994 is a wasteful number, since it uses less digits than its factorization.

21003110994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2595.

The product of its (nonzero) digits is 1944, while the sum is 30.

The spelling of 21003110994 in words is "twenty-one billion, three million, one hundred ten thousand, nine hundred ninety-four".