121287100 has 36 divisors (see below), whose sum is σ = 287122248. Its totient is φ = 44104000.

The previous prime is 121287083. The next prime is 121287109. The reversal of 121287100 is 1782121.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121287109) 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, 54031 + ... + 56230.

It is an arithmetic number, because the mean of its divisors is an integer number (7975618).

Almost surely, 2^121287100 is an apocalyptic number.

121287100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121287100 is an abundant number, since it is smaller than the sum of its proper divisors (165835148).

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

121287100 is a wasteful number, since it uses less digits than its factorization.

121287100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110286 (or 110279 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 22.

The square root of 121287100 is about 11013.0422681473. The cubic root of 121287100 is about 494.9996258882. Note that the first 3 decimals are identical.

The spelling of 121287100 in words is "one hundred twenty-one million, two hundred eighty-seven thousand, one hundred".