121709824 has 18 divisors (see below), whose sum is σ = 242944730. Its totient is φ = 60854784.

The previous prime is 121709821. The next prime is 121709831. The reversal of 121709824 is 428907121.

It can be written as a sum of positive squares in only one way, i.e., 115949824 + 5760000 = 10768^2 + 2400^2 .

It is a super-2 number, since 2×121709824² = 29626562516221952, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 121709824.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121709821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 237459 + ... + 237970.

Almost surely, 2^121709824 is an apocalyptic number.

It is an amenable number.

121709824 is a deficient number, since it is larger than the sum of its proper divisors (121234906).

121709824 is an frugal number, since it uses more digits than its factorization.

121709824 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 475445 (or 475431 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 34.

The square root of 121709824 is about 11032.2175468035. The cubic root of 121709824 is about 495.5740359524.

The spelling of 121709824 in words is "one hundred twenty-one million, seven hundred nine thousand, eight hundred twenty-four".