220001212100 has 36 divisors (see below), whose sum is σ = 479383606548. Its totient is φ = 87635328000.

The previous prime is 220001212049. The next prime is 220001212117. The reversal of 220001212100 is 1212100022.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 26262147136 + 193739064964 = 162056^2 + 440158^2 .

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, 4540241 + ... + 4588440.

It is an arithmetic number, because the mean of its divisors is an integer number (13316211293).

Almost surely, 2^220001212100 is an apocalyptic number.

220001212100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

220001212100 is an abundant number, since it is smaller than the sum of its proper divisors (259382394448).

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

220001212100 is a wasteful number, since it uses less digits than its factorization.

220001212100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9128936 (or 9128929 counting only the distinct ones).

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

Adding to 220001212100 its reverse (1212100022), we get a palindrome (221213312122).

The spelling of 220001212100 in words is "two hundred twenty billion, one million, two hundred twelve thousand, one hundred".