121859521 has 27 divisors (see below), whose sum is σ = 151432641. Its totient is φ = 97761384.

The previous prime is 121859477. The next prime is 121859527. The reversal of 121859521 is 125958121.

The square root of 121859521 is 11039.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 121859521 - 2⁷ = 121859393 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121859527) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 1468146 + ... + 1468228.

Almost surely, 2^121859521 is an apocalyptic number.

121859521 is the 11039-th square number.

121859521 is the 5520-th centered octagonal number.

It is an amenable number.

121859521 is a deficient number, since it is larger than the sum of its proper divisors (29573120).

121859521 is an frugal number, since it uses more digits than its factorization.

121859521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 218 (or 109 counting only the distinct ones).

The product of its digits is 7200, while the sum is 34.

The cubic root of 121859521 is about 495.7771298079. Note that the first 3 decimals are identical.

The spelling of 121859521 in words is "one hundred twenty-one million, eight hundred fifty-nine thousand, five hundred twenty-one".