121231100 has 36 divisors (see below), whose sum is σ = 266691264. Its totient is φ = 47825280.

The previous prime is 121231093. The next prime is 121231133. The reversal of 121231100 is 1132121.

It is a congruent number.

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, 1004 + ... + 15603.

Almost surely, 2^121231100 is an apocalyptic number.

121231100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121231100 is an abundant number, since it is smaller than the sum of its proper divisors (145460164).

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

121231100 is a wasteful number, since it uses less digits than its factorization.

121231100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16694 (or 16687 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 11.

The square root of 121231100 is about 11010.4995345352. The cubic root of 121231100 is about 494.9234313427.

Adding to 121231100 its reverse (1132121), we get a palindrome (122363221).

The spelling of 121231100 in words is "one hundred twenty-one million, two hundred thirty-one thousand, one hundred".