121320100 has 36 divisors (see below), whose sum is σ = 287200368. Its totient is φ = 44116000.

The previous prime is 121320061. The next prime is 121320103. The reversal of 121320100 is 1023121.

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

It is not an unprimeable number, because it can be changed into a prime (121320103) 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, 54046 + ... + 56245.

It is an arithmetic number, because the mean of its divisors is an integer number (7977788).

Almost surely, 2^121320100 is an apocalyptic number.

121320100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121320100 is an abundant number, since it is smaller than the sum of its proper divisors (165880268).

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

121320100 is a wasteful number, since it uses less digits than its factorization.

121320100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110316 (or 110309 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 10.

The square root of 121320100 is about 11014.5403898665. The cubic root of 121320100 is about 495.0445152634.

Adding to 121320100 its reverse (1023121), we get a palindrome (122343221).

The spelling of 121320100 in words is "one hundred twenty-one million, three hundred twenty thousand, one hundred".