21202222100 has 36 divisors (see below), whose sum is σ = 46044740448. Its totient is φ = 8474268000.

The previous prime is 21202222099. The next prime is 21202222109. The reversal of 21202222100 is 122220212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21202222109) 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, 46985 + ... + 211215.

It is an arithmetic number, because the mean of its divisors is an integer number (1279020568).

Almost surely, 2^21202222100 is an apocalyptic number.

21202222100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21202222100 is an abundant number, since it is smaller than the sum of its proper divisors (24842518348).

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

21202222100 is a wasteful number, since it uses less digits than its factorization.

21202222100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165536 (or 165529 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 14.

Adding to 21202222100 its reverse (122220212), we get a palindrome (21324442312).

The spelling of 21202222100 in words is "twenty-one billion, two hundred two million, two hundred twenty-two thousand, one hundred".