121400042 has 4 divisors (see below), whose sum is σ = 182100066. Its totient is φ = 60700020.

The previous prime is 121400017. The next prime is 121400053. The reversal of 121400042 is 240004121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 91795561 + 29604481 = 9581^2 + 5441^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30350009 + ... + 30350012.

Almost surely, 2^121400042 is an apocalyptic number.

121400042 is a deficient number, since it is larger than the sum of its proper divisors (60700024).

121400042 is an equidigital number, since it uses as much as digits as its factorization.

121400042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60700023.

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 121400042 is about 11018.1687226145. The cubic root of 121400042 is about 495.1532253601.

Adding to 121400042 its reverse (240004121), we get a palindrome (361404163).

The spelling of 121400042 in words is "one hundred twenty-one million, four hundred thousand, forty-two".