12212121100 has 36 divisors (see below), whose sum is σ = 26516287224. Its totient is φ = 4881902080.

The previous prime is 12212121079. The next prime is 12212121143. The reversal of 12212121100 is 112121221.

It is a super-2 number, since 2×12212121100² (a number of 21 digits) contains 22 as substring.

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, 133719 + ... + 205681.

It is an arithmetic number, because the mean of its divisors is an integer number (736563534).

Almost surely, 2^12212121100 is an apocalyptic number.

12212121100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12212121100 is an abundant number, since it is smaller than the sum of its proper divisors (14304166124).

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

12212121100 is a wasteful number, since it uses less digits than its factorization.

12212121100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73674 (or 73667 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 12212121100 its reverse (112121221), we get a palindrome (12324242321).

The spelling of 12212121100 in words is "twelve billion, two hundred twelve million, one hundred twenty-one thousand, one hundred".