21123100230 has 64 divisors (see below), whose sum is σ = 52358455296. Its totient is φ = 5448240000.

The previous prime is 21123100211. The next prime is 21123100241. The reversal of 21123100230 is 3200132112.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 2181600 + ... + 2191260.

It is an arithmetic number, because the mean of its divisors is an integer number (818100864).

Almost surely, 2^21123100230 is an apocalyptic number.

21123100230 is an abundant number, since it is smaller than the sum of its proper divisors (31235355066).

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

21123100230 is a wasteful number, since it uses less digits than its factorization.

21123100230 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12053.

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 21123100230 its reverse (3200132112), we get a palindrome (24323232342).

The spelling of 21123100230 in words is "twenty-one billion, one hundred twenty-three million, one hundred thousand, two hundred thirty".