221212022212100 has 72 divisors (see below), whose sum is σ = 486325325270400. Its totient is φ = 87325405315200.

The previous prime is 221212022212081. The next prime is 221212022212169. The reversal of 221212022212100 is 1212220212122.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11242091 + ... + 23849709.

Almost surely, 2^{221212022212100} is an apocalyptic number.

221212022212100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221212022212100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (243162662635200).

221212022212100 is an abundant number, since it is smaller than the sum of its proper divisors (265113303058300).

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

221212022212100 is a wasteful number, since it uses less digits than its factorization.

221212022212100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12609933 (or 12609926 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 221212022212100 its reverse (1212220212122), we get a palindrome (222424242424222).

It can be divided in two parts, 221212022 and 212100, that added together give a palindrome (221424122).

The spelling of 221212022212100 in words is "two hundred twenty-one trillion, two hundred twelve billion, twenty-two million, two hundred twelve thousand, one hundred".