121620120 has 32 divisors (see below), whose sum is σ = 364860720. Its totient is φ = 32432000.

The previous prime is 121620119. The next prime is 121620127. The reversal of 121620120 is 21026121.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 121620120.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121620127) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 506631 + ... + 506870.

Almost surely, 2^121620120 is an apocalyptic number.

121620120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121620120 is an abundant number, since it is smaller than the sum of its proper divisors (243240600).

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

121620120 is a wasteful number, since it uses less digits than its factorization.

121620120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1013515 (or 1013511 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 121620120 is about 11028.1512503230. The cubic root of 121620120 is about 495.4522547685.

Adding to 121620120 its reverse (21026121), we get a palindrome (142646241).

The spelling of 121620120 in words is "one hundred twenty-one million, six hundred twenty thousand, one hundred twenty".