42121220143 has 4 divisors (see below), whose sum is σ = 43573676040. Its totient is φ = 40668764248.

The previous prime is 42121220107. The next prime is 42121220149. The reversal of 42121220143 is 34102212124.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42121220143 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42121220149) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 726227905 + ... + 726227962.

It is an arithmetic number, because the mean of its divisors is an integer number (10893419010).

Almost surely, 2^42121220143 is an apocalyptic number.

42121220143 is a deficient number, since it is larger than the sum of its proper divisors (1452455897).

42121220143 is a wasteful number, since it uses less digits than its factorization.

42121220143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1452455896.

The product of its (nonzero) digits is 768, while the sum is 22.

Adding to 42121220143 its reverse (34102212124), we get a palindrome (76223432267).

The spelling of 42121220143 in words is "forty-two billion, one hundred twenty-one million, two hundred twenty thousand, one hundred forty-three".