121438563 has 16 divisors (see below), whose sum is σ = 169267200. Its totient is φ = 77351040.

The previous prime is 121438547. The next prime is 121438589. The reversal of 121438563 is 365834121.

It is not a de Polignac number, because 121438563 - 2⁴ = 121438547 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (121438523) 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 15 ways as a sum of consecutive naturals, for example, 918 + ... + 15611.

It is an arithmetic number, because the mean of its divisors is an integer number (10579200).

Almost surely, 2^121438563 is an apocalyptic number.

121438563 is a deficient number, since it is larger than the sum of its proper divisors (47828637).

121438563 is a wasteful number, since it uses less digits than its factorization.

121438563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16642.

The product of its digits is 17280, while the sum is 33.

The square root of 121438563 is about 11019.9166512274. The cubic root of 121438563 is about 495.2055915702.

It can be divided in two parts, 12143 and 8563, that added together give a triangular number (20706 = T₂₀₃).

The spelling of 121438563 in words is "one hundred twenty-one million, four hundred thirty-eight thousand, five hundred sixty-three".