121243872 has 24 divisors (see below), whose sum is σ = 318265416. Its totient is φ = 40414592.

The previous prime is 121243853. The next prime is 121243873. The reversal of 121243872 is 278342121.

It is a tau number, because it is divible by the number of its divisors (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121243873) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 631383 + ... + 631574.

It is an arithmetic number, because the mean of its divisors is an integer number (13261059).

Almost surely, 2^121243872 is an apocalyptic number.

121243872 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

121243872 is an abundant number, since it is smaller than the sum of its proper divisors (197021544).

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

121243872 is a wasteful number, since it uses less digits than its factorization.

121243872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1262970 (or 1262962 counting only the distinct ones).

The product of its digits is 5376, while the sum is 30.

The square root of 121243872 is about 11011.0795111106. The cubic root of 121243872 is about 494.9408112067.

Adding to 121243872 its reverse (278342121), we get a palindrome (399585993).

The spelling of 121243872 in words is "one hundred twenty-one million, two hundred forty-three thousand, eight hundred seventy-two".