220021032100 has 36 divisors (see below), whose sum is σ = 477481117204. Its totient is φ = 88001873280.

The previous prime is 220021032047. The next prime is 220021032109. The reversal of 220021032100 is 1230120022.

It can be written as a sum of positive squares in 6 ways, for example, as 63475779136 + 156545252964 = 251944^2 + 395658^2 .

It is not an unprimeable number, because it can be changed into a prime (220021032109) 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, 1405354 + ... + 1554046.

Almost surely, 2^220021032100 is an apocalyptic number.

220021032100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

220021032100 is an abundant number, since it is smaller than the sum of its proper divisors (257460085104).

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

220021032100 is a wasteful number, since it uses less digits than its factorization.

220021032100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163504 (or 163497 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 13.

Adding to 220021032100 its reverse (1230120022), we get a palindrome (221251152122).

The spelling of 220021032100 in words is "two hundred twenty billion, twenty-one million, thirty-two thousand, one hundred".