121131100 has 18 divisors (see below), whose sum is σ = 262854704. Its totient is φ = 48452400.

The previous prime is 121131077. The next prime is 121131121. The reversal of 121131100 is 1131121.

It is a Harshad number since it is a multiple of its sum of digits (10).

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, 605556 + ... + 605755.

Almost surely, 2^121131100 is an apocalyptic number.

121131100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121131100 is an abundant number, since it is smaller than the sum of its proper divisors (141723604).

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

121131100 is a wasteful number, since it uses less digits than its factorization.

121131100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1211325 (or 1211318 counting only the distinct ones).

The product of its (nonzero) digits is 6, while the sum is 10.

The square root of 121131100 is about 11005.9574776573. The cubic root of 121131100 is about 494.7873112722.

Adding to 121131100 its reverse (1131121), we get a palindrome (122262221).

The spelling of 121131100 in words is "one hundred twenty-one million, one hundred thirty-one thousand, one hundred".