121543642 has 16 divisors (see below), whose sum is σ = 210589632. Its totient is φ = 51997120.

The previous prime is 121543607. The next prime is 121543649. The reversal of 121543642 is 246345121.

It is a self number, because there is not a number n which added to its sum of digits gives 121543642.

It is not an unprimeable number, because it can be changed into a prime (121543649) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 162118 + ... + 162865.

It is an arithmetic number, because the mean of its divisors is an integer number (13161852).

Almost surely, 2^121543642 is an apocalyptic number.

121543642 is a deficient number, since it is larger than the sum of its proper divisors (89045990).

121543642 is a wasteful number, since it uses less digits than its factorization.

121543642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 325013.

The product of its digits is 5760, while the sum is 28.

The square root of 121543642 is about 11024.6833061091. The cubic root of 121543642 is about 495.3483817617.

Adding to 121543642 its reverse (246345121), we get a palindrome (367888763).

The spelling of 121543642 in words is "one hundred twenty-one million, five hundred forty-three thousand, six hundred forty-two".