2100221212100 has 54 divisors (see below), whose sum is σ = 5009461549722. Its totient is φ = 763716800000.

The previous prime is 2100221212093. The next prime is 2100221212109. The reversal of 2100221212100 is 12121220012.

It can be written as a sum of positive squares in 3 ways, for example, as 578220326464 + 1522000885636 = 760408^2 + 1233694^2 .

It is not an unprimeable number, because it can be changed into a prime (2100221212109) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 86773901 + ... + 86798100.

Almost surely, 2^{2100221212100} is an apocalyptic number.

2100221212100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2100221212100 is an abundant number, since it is smaller than the sum of its proper divisors (2909240337622).

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

2100221212100 is a wasteful number, since it uses less digits than its factorization.

2100221212100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173572037 (or 173572019 counting only the distinct ones).

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

Adding to 2100221212100 its reverse (12121220012), we get a palindrome (2112342432112).

The spelling of 2100221212100 in words is "two trillion, one hundred billion, two hundred twenty-one million, two hundred twelve thousand, one hundred".