21103223500 has 48 divisors (see below), whose sum is σ = 46738665792. Its totient is φ = 8322384000.

The previous prime is 21103223459. The next prime is 21103223503. The reversal of 21103223500 is 532230112.

It is not an unprimeable number, because it can be changed into a prime (21103223503) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 261729 + ... + 332728.

It is an arithmetic number, because the mean of its divisors is an integer number (973722204).

Almost surely, 2^21103223500 is an apocalyptic number.

21103223500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21103223500 is an abundant number, since it is smaller than the sum of its proper divisors (25635442292).

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

21103223500 is a wasteful number, since it uses less digits than its factorization.

21103223500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 594547 (or 594535 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 19.

Adding to 21103223500 its reverse (532230112), we get a palindrome (21635453612).

The spelling of 21103223500 in words is "twenty-one billion, one hundred three million, two hundred twenty-three thousand, five hundred".