42020021234 has 4 divisors (see below), whose sum is σ = 63030031854. Its totient is φ = 21010010616.

The previous prime is 42020021233. The next prime is 42020021249. The reversal of 42020021234 is 43212002024.

42020021234 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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., 39320907025 + 2699114209 = 198295^2 + 51953^2 .

It is not an unprimeable number, because it can be changed into a prime (42020021231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10505005307 + ... + 10505005310.

Almost surely, 2^42020021234 is an apocalyptic number.

42020021234 is a deficient number, since it is larger than the sum of its proper divisors (21010010620).

42020021234 is a wasteful number, since it uses less digits than its factorization.

42020021234 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21010010619.

The product of its (nonzero) digits is 768, while the sum is 20.

Adding to 42020021234 its reverse (43212002024), we get a palindrome (85232023258).

The spelling of 42020021234 in words is "forty-two billion, twenty million, twenty-one thousand, two hundred thirty-four".