21102119994 has 24 divisors (see below), whose sum is σ = 44118994752. Its totient is φ = 6728211160.

The previous prime is 21102119993. The next prime is 21102120041. The reversal of 21102119994 is 49991120112.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21102119993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3321042 + ... + 3327389.

It is an arithmetic number, because the mean of its divisors is an integer number (1838291448).

Almost surely, 2^21102119994 is an apocalyptic number.

21102119994 is an abundant number, since it is smaller than the sum of its proper divisors (23016874758).

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

21102119994 is a wasteful number, since it uses less digits than its factorization.

21102119994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6648482 (or 6648459 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 39.

The spelling of 21102119994 in words is "twenty-one billion, one hundred two million, one hundred nineteen thousand, nine hundred ninety-four".