121373720 has 64 divisors (see below), whose sum is σ = 297138240. Its totient is φ = 44352000.

The previous prime is 121373701. The next prime is 121373731. The reversal of 121373720 is 27373121.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a self number, because there is not a number n which added to its sum of digits gives 121373720.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 51365 + ... + 53675.

It is an arithmetic number, because the mean of its divisors is an integer number (4642785).

Almost surely, 2^121373720 is an apocalyptic number.

121373720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 121373720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (148569120).

121373720 is an abundant number, since it is smaller than the sum of its proper divisors (175764520).

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

121373720 is a wasteful number, since it uses less digits than its factorization.

121373720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2436 (or 2432 counting only the distinct ones).

The product of its (nonzero) digits is 1764, while the sum is 26.

The square root of 121373720 is about 11016.9741762428. The cubic root of 121373720 is about 495.1174363409.

The spelling of 121373720 in words is "one hundred twenty-one million, three hundred seventy-three thousand, seven hundred twenty".