21220111102100 has 36 divisors (see below), whose sum is σ = 46352592390048. Its totient is φ = 8431832220000.

The previous prime is 21220111102051. The next prime is 21220111102139. The reversal of 21220111102100 is 120111102212.

It is a congruent number.

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, 702637586 + ... + 702667785.

Almost surely, 2^{21220111102100} is an apocalyptic number.

21220111102100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21220111102100 is an abundant number, since it is smaller than the sum of its proper divisors (25132481287948).

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

21220111102100 is a wasteful number, since it uses less digits than its factorization.

21220111102100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1405305536 (or 1405305529 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21220111102100 its reverse (120111102212), we get a palindrome (21340222204312).

The spelling of 21220111102100 in words is "twenty-one trillion, two hundred twenty billion, one hundred eleven million, one hundred two thousand, one hundred".