21211201100 has 36 divisors (see below), whose sum is σ = 46082076600. Its totient is φ = 8474568960.

The previous prime is 21211201093. The next prime is 21211201111. The reversal of 21211201100 is 110211212.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 37565 + ... + 209364.

Almost surely, 2^21211201100 is an apocalyptic number.

21211201100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21211201100 is an abundant number, since it is smaller than the sum of its proper divisors (24870875500).

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

21211201100 is a wasteful number, since it uses less digits than its factorization.

21211201100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 247802 (or 247795 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 21211201100 its reverse (110211212), we get a palindrome (21321412312).

The spelling of 21211201100 in words is "twenty-one billion, two hundred eleven million, two hundred one thousand, one hundred".