100212122220 has 96 divisors (see below), whose sum is σ = 323516809728. Its totient is φ = 22702912512.

The previous prime is 100212122191. The next prime is 100212122221. The reversal of 100212122220 is 22221212001.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 100212122220.

It is not an unprimeable number, because it can be changed into a prime (100212122221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1008294 + ... + 1103213.

It is an arithmetic number, because the mean of its divisors is an integer number (3369966768).

Almost surely, 2^100212122220 is an apocalyptic number.

100212122220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

100212122220 is an abundant number, since it is smaller than the sum of its proper divisors (223304687508).

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

100212122220 is a wasteful number, since it uses less digits than its factorization.

100212122220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2111639 (or 2111637 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 100212122220 its reverse (22221212001), we get a palindrome (122433334221).

The spelling of 100212122220 in words is "one hundred billion, two hundred twelve million, one hundred twenty-two thousand, two hundred twenty".