121435642 has 16 divisors (see below), whose sum is σ = 183600000. Its totient is φ = 60238080.

The previous prime is 121435637. The next prime is 121435651. The reversal of 121435642 is 246534121.

It is a self number, because there is not a number n which added to its sum of digits gives 121435642.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 243109 + ... + 243607.

It is an arithmetic number, because the mean of its divisors is an integer number (11475000).

Almost surely, 2^121435642 is an apocalyptic number.

121435642 is a deficient number, since it is larger than the sum of its proper divisors (62164358).

121435642 is a wasteful number, since it uses less digits than its factorization.

121435642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1221.

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

The square root of 121435642 is about 11019.7841176676. The cubic root of 121435642 is about 495.2016210930.

Adding to 121435642 its reverse (246534121), we get a palindrome (367969763).

It can be divided in two parts, 1214 and 35642, that added together give a triangular number (36856 = T₂₇₁).

The spelling of 121435642 in words is "one hundred twenty-one million, four hundred thirty-five thousand, six hundred forty-two".