121620408 has 128 divisors (see below), whose sum is σ = 377395200. Its totient is φ = 31804416.

The previous prime is 121620379. The next prime is 121620419. The reversal of 121620408 is 804026121.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 508753 + ... + 508991.

It is an arithmetic number, because the mean of its divisors is an integer number (2948400).

Almost surely, 2^121620408 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 121620408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (188697600).

121620408 is an abundant number, since it is smaller than the sum of its proper divisors (255774792).

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

121620408 is a wasteful number, since it uses less digits than its factorization.

121620408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 501 (or 497 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 24.

The square root of 121620408 is about 11028.1643078075. The cubic root of 121620408 is about 495.4526458500.

Adding to 121620408 its reverse (804026121), we get a palindrome (925646529).

The spelling of 121620408 in words is "one hundred twenty-one million, six hundred twenty thousand, four hundred eight".