42021221243 has 4 divisors (see below), whose sum is σ = 42814074528. Its totient is φ = 41228367960.

The previous prime is 42021221213. The next prime is 42021221261. The reversal of 42021221243 is 34212212024.

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

It is a cyclic number.

It is not a de Polignac number, because 42021221243 - 2⁸ = 42021220987 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42021221213) 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, 396426563 + ... + 396426668.

It is an arithmetic number, because the mean of its divisors is an integer number (10703518632).

Almost surely, 2^42021221243 is an apocalyptic number.

42021221243 is a deficient number, since it is larger than the sum of its proper divisors (792853285).

42021221243 is an equidigital number, since it uses as much as digits as its factorization.

42021221243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 792853284.

The product of its (nonzero) digits is 1536, while the sum is 23.

Adding to 42021221243 its reverse (34212212024), we get a palindrome (76233433267).

The spelling of 42021221243 in words is "forty-two billion, twenty-one million, two hundred twenty-one thousand, two hundred forty-three".