121220042 has 4 divisors (see below), whose sum is σ = 181830066. Its totient is φ = 60610020.

The previous prime is 121220041. The next prime is 121220069. The reversal of 121220042 is 240022121.

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., 115971361 + 5248681 = 10769^2 + 2291^2 .

It is a junction number, because it is equal to n+sod(n) for n = 121219999 and 121220026.

It is not an unprimeable number, because it can be changed into a prime (121220041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30305009 + ... + 30305012.

Almost surely, 2^121220042 is an apocalyptic number.

121220042 is a deficient number, since it is larger than the sum of its proper divisors (60610024).

121220042 is an equidigital number, since it uses as much as digits as its factorization.

121220042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60610023.

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

The square root of 121220042 is about 11009.9973660306. The cubic root of 121220042 is about 494.9083828672.

Adding to 121220042 its reverse (240022121), we get a palindrome (361242163).

The spelling of 121220042 in words is "one hundred twenty-one million, two hundred twenty thousand, forty-two".