121420142 has 4 divisors (see below), whose sum is σ = 182130216. Its totient is φ = 60710070.

The previous prime is 121420133. The next prime is 121420163. The reversal of 121420142 is 241024121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 241024121 = 13 ⋅18540317.

It is a self number, because there is not a number n which added to its sum of digits gives 121420142.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30355034 + ... + 30355037.

It is an arithmetic number, because the mean of its divisors is an integer number (45532554).

Almost surely, 2^121420142 is an apocalyptic number.

121420142 is a deficient number, since it is larger than the sum of its proper divisors (60710074).

121420142 is an equidigital number, since it uses as much as digits as its factorization.

121420142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60710073.

The product of its (nonzero) digits is 128, while the sum is 17.

The square root of 121420142 is about 11019.0808146596. The cubic root of 121420142 is about 495.1805510799.

Adding to 121420142 its reverse (241024121), we get a palindrome (362444263).

The spelling of 121420142 in words is "one hundred twenty-one million, four hundred twenty thousand, one hundred forty-two".