220021102100 has 36 divisors (see below), whose sum is σ = 483986160924. Its totient is φ = 86802842880.

The previous prime is 220021102099. The next prime is 220021102109. The reversal of 220021102100 is 1201120022.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 13116204676 + 206904897424 = 114526^2 + 454868^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220021102109) 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, 15062639 + ... + 15077238.

Almost surely, 2^220021102100 is an apocalyptic number.

220021102100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

220021102100 is an abundant number, since it is smaller than the sum of its proper divisors (263965058824).

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

220021102100 is a wasteful number, since it uses less digits than its factorization.

220021102100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30139964 (or 30139957 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 220021102100 its reverse (1201120022), we get a palindrome (221222222122).

The spelling of 220021102100 in words is "two hundred twenty billion, twenty-one million, one hundred two thousand, one hundred".