21223020100 has 36 divisors (see below), whose sum is σ = 46571433300. Its totient is φ = 8393820160.

The previous prime is 21223020061. The next prime is 21223020107. The reversal of 21223020100 is 102032212.

It can be written as a sum of positive squares in 6 ways, for example, as 1267502404 + 19955517696 = 35602^2 + 141264^2 .

It is not an unprimeable number, because it can be changed into a prime (21223020107) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1183405 + ... + 1201204.

It is an arithmetic number, because the mean of its divisors is an integer number (1293650925).

Almost surely, 2^21223020100 is an apocalyptic number.

21223020100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21223020100 is an abundant number, since it is smaller than the sum of its proper divisors (25348413200).

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

21223020100 is a wasteful number, since it uses less digits than its factorization.

21223020100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2384712 (or 2384705 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 13.

Adding to 21223020100 its reverse (102032212), we get a palindrome (21325052312).

The spelling of 21223020100 in words is "twenty-one billion, two hundred twenty-three million, twenty thousand, one hundred".