121213872 has 120 divisors (see below), whose sum is σ = 370747104. Its totient is φ = 36744192.

The previous prime is 121213871. The next prime is 121213889. The reversal of 121213872 is 278312121.

It is not an unprimeable number, because it can be changed into a prime (121213871) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 136213 + ... + 137099.

Almost surely, 2^121213872 is an apocalyptic number.

121213872 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 121213872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (185373552).

121213872 is an abundant number, since it is smaller than the sum of its proper divisors (249533232).

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

121213872 is a wasteful number, since it uses less digits than its factorization.

121213872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 987 (or 978 counting only the distinct ones).

The product of its digits is 1344, while the sum is 27.

The square root of 121213872 is about 11009.7171625796. The cubic root of 121213872 is about 494.8999859155.

Adding to 121213872 its reverse (278312121), we get a palindrome (399525993).

The spelling of 121213872 in words is "one hundred twenty-one million, two hundred thirteen thousand, eight hundred seventy-two".