121520100 has 72 divisors (see below), whose sum is σ = 378656320. Its totient is φ = 29911680.

The previous prime is 121520089. The next prime is 121520101. The reversal of 121520100 is 1025121.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is not an unprimeable number, because it can be changed into a prime (121520101) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11680 + ... + 19479.

Almost surely, 2^121520100 is an apocalyptic number.

121520100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121520100 is an abundant number, since it is smaller than the sum of its proper divisors (257136220).

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

121520100 is a wasteful number, since it uses less digits than its factorization.

121520100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31189 (or 31182 counting only the distinct ones).

The product of its (nonzero) digits is 20, while the sum is 12.

The square root of 121520100 is about 11023.6155593344. The cubic root of 121520100 is about 495.3163980660.

Adding to 121520100 its reverse (1025121), we get a palindrome (122545221).

The spelling of 121520100 in words is "one hundred twenty-one million, five hundred twenty thousand, one hundred".