42120304421 has 4 divisors (see below), whose sum is σ = 45360327852. Its totient is φ = 38880280992.

The previous prime is 42120304403. The next prime is 42120304433. The reversal of 42120304421 is 12440302124.

42120304421 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 2 ways, for example, as 26801291521 + 15319012900 = 163711^2 + 123770^2 .

It is a cyclic number.

It is not a de Polignac number, because 42120304421 - 2⁶ = 42120304357 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 (42120304481) 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, 1620011696 + ... + 1620011721.

It is an arithmetic number, because the mean of its divisors is an integer number (11340081963).

Almost surely, 2^42120304421 is an apocalyptic number.

It is an amenable number.

42120304421 is a deficient number, since it is larger than the sum of its proper divisors (3240023431).

42120304421 is a wasteful number, since it uses less digits than its factorization.

42120304421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3240023430.

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

Adding to 42120304421 its reverse (12440302124), we get a palindrome (54560606545).

The spelling of 42120304421 in words is "forty-two billion, one hundred twenty million, three hundred four thousand, four hundred twenty-one".