121996724 has 24 divisors (see below), whose sum is σ = 218461320. Its totient is φ = 59595264.

The previous prime is 121996723. The next prime is 121996747. The reversal of 121996724 is 427699121.

121996724 = T₃₃₂ + T₃₃₃ + ... + T₉₁₅.

It can be written as a sum of positive squares in 4 ways, for example, as 16564900 + 105431824 = 4070^2 + 10268^2 .

It is a Smith number, since the sum of its digits (41) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121996723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29912 + ... + 33744.

It is an arithmetic number, because the mean of its divisors is an integer number (9102555).

Almost surely, 2^121996724 is an apocalyptic number.

It is an amenable number.

121996724 is a deficient number, since it is larger than the sum of its proper divisors (96464596).

121996724 is a wasteful number, since it uses less digits than its factorization.

121996724 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4019 (or 4017 counting only the distinct ones).

The product of its digits is 54432, while the sum is 41.

The square root of 121996724 is about 11045.2127186397. The cubic root of 121996724 is about 495.9631270282.

The spelling of 121996724 in words is "one hundred twenty-one million, nine hundred ninety-six thousand, seven hundred twenty-four".