121222100 has 18 divisors (see below), whose sum is σ = 263052174. Its totient is φ = 48488800.

The previous prime is 121222099. The next prime is 121222133. The reversal of 121222100 is 1222121.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 9412624 + 111809476 = 3068^2 + 10574^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 606011 + ... + 606210.

Almost surely, 2^121222100 is an apocalyptic number.

121222100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121222100 is an abundant number, since it is smaller than the sum of its proper divisors (141830074).

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

121222100 is a wasteful number, since it uses less digits than its factorization.

121222100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1212235 (or 1212228 counting only the distinct ones).

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

The square root of 121222100 is about 11010.0908261467. The cubic root of 121222100 is about 494.9111836023.

Adding to 121222100 its reverse (1222121), we get a palindrome (122444221).

The spelling of 121222100 in words is "one hundred twenty-one million, two hundred twenty-two thousand, one hundred".