21100113234 has 24 divisors (see below), whose sum is σ = 47191652352. Its totient is φ = 6806487960.

The previous prime is 21100113233. The next prime is 21100113241. The reversal of 21100113234 is 43231100112.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (21100113233) 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, 18906354 + ... + 18907469.

It is an arithmetic number, because the mean of its divisors is an integer number (1966318848).

Almost surely, 2^21100113234 is an apocalyptic number.

21100113234 is an abundant number, since it is smaller than the sum of its proper divisors (26091539118).

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

21100113234 is a wasteful number, since it uses less digits than its factorization.

21100113234 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37813862 (or 37813859 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 21100113234 its reverse (43231100112), we get a palindrome (64331213346).

The spelling of 21100113234 in words is "twenty-one billion, one hundred million, one hundred thirteen thousand, two hundred thirty-four".