12221997100 has 36 divisors (see below), whose sum is σ = 26578626984. Its totient is φ = 4878311680.

The previous prime is 12221997097. The next prime is 12221997103. The reversal of 12221997100 is 179912221.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (12221997097) and next prime (12221997103).

It is a super-2 number, since 2×12221997100² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12221997103) 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, 84157 + ... + 177556.

It is an arithmetic number, because the mean of its divisors is an integer number (738295194).

Almost surely, 2^12221997100 is an apocalyptic number.

12221997100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12221997100 is an abundant number, since it is smaller than the sum of its proper divisors (14356629884).

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

12221997100 is a wasteful number, since it uses less digits than its factorization.

12221997100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 262194 (or 262187 counting only the distinct ones).

The product of its (nonzero) digits is 4536, while the sum is 34.

The spelling of 12221997100 in words is "twelve billion, two hundred twenty-one million, nine hundred ninety-seven thousand, one hundred".