42121402003243 has 4 divisors (see below), whose sum is σ = 42195429072360. Its totient is φ = 42047374934128.

The previous prime is 42121402003237. The next prime is 42121402003249. The reversal of 42121402003243 is 34230020412124.

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

It is an interprime number because it is at equal distance from previous prime (42121402003237) and next prime (42121402003249).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42121402003243 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42121402003249) 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, 37013533705 + ... + 37013534842.

It is an arithmetic number, because the mean of its divisors is an integer number (10548857268090).

Almost surely, 2^{42121402003243} is an apocalyptic number.

42121402003243 is a deficient number, since it is larger than the sum of its proper divisors (74027069117).

42121402003243 is an equidigital number, since it uses as much as digits as its factorization.

42121402003243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74027069116.

The product of its (nonzero) digits is 9216, while the sum is 28.

Adding to 42121402003243 its reverse (34230020412124), we get a palindrome (76351422415367).

The spelling of 42121402003243 in words is "forty-two trillion, one hundred twenty-one billion, four hundred two million, three thousand, two hundred forty-three".