121573872 has 140 divisors (see below), whose sum is σ = 403885360. Its totient is φ = 34712064.

The previous prime is 121573871. The next prime is 121573873. The reversal of 121573872 is 278375121.

121573872 is a `hidden beast` number, since 1 + 2 + 1 + 573 + 87 + 2 = 666.

It is an interprime number because it is at equal distance from previous prime (121573871) and next prime (121573873).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121573871) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 80904 + ... + 82392.

Almost surely, 2^121573872 is an apocalyptic number.

121573872 is a gapful number since it is divisible by the number (12) 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 121573872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (201942680).

121573872 is an abundant number, since it is smaller than the sum of its proper divisors (282311488).

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

121573872 is an equidigital number, since it uses as much as digits as its factorization.

121573872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1522 (or 1501 counting only the distinct ones).

The product of its digits is 23520, while the sum is 36.

The square root of 121573872 is about 11026.0542353101. The cubic root of 121573872 is about 495.3894455860.

The spelling of 121573872 in words is "one hundred twenty-one million, five hundred seventy-three thousand, eight hundred seventy-two".