21222001102100 has 18 divisors (see below), whose sum is σ = 46051742391774. Its totient is φ = 8488800440800.

The previous prime is 21222001102091. The next prime is 21222001102129. The reversal of 21222001102100 is 120110022212.

It can be written as a sum of positive squares in 3 ways, for example, as 2227013013124 + 18994988088976 = 1492318^2 + 4358324^2 .

It is a super-2 number, since 2×21222001102100² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 106110005411 + ... + 106110005610.

Almost surely, 2^{21222001102100} is an apocalyptic number.

21222001102100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21222001102100 is an abundant number, since it is smaller than the sum of its proper divisors (24829741289674).

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

21222001102100 is a wasteful number, since it uses less digits than its factorization.

21222001102100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 212220011035 (or 212220011028 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21222001102100 its reverse (120110022212), we get a palindrome (21342111124312).

The spelling of 21222001102100 in words is "twenty-one trillion, two hundred twenty-two billion, one million, one hundred two thousand, one hundred".