42389575421 has 4 divisors (see below), whose sum is σ = 42420271644. Its totient is φ = 42358879200.

The previous prime is 42389575411. The next prime is 42389575447. The reversal of 42389575421 is 12457598324.

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 19940546521 + 22449028900 = 141211^2 + 149830^2 .

It is a cyclic number.

It is not a de Polignac number, because 42389575421 - 2⁶ = 42389575357 is a prime.

It is a super-2 number, since 2×42389575421² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 42389575421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42389575411) 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, 15346040 + ... + 15348801.

It is an arithmetic number, because the mean of its divisors is an integer number (10605067911).

Almost surely, 2^42389575421 is an apocalyptic number.

It is an amenable number.

42389575421 is a deficient number, since it is larger than the sum of its proper divisors (30696223).

42389575421 is a wasteful number, since it uses less digits than its factorization.

42389575421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30696222.

The product of its digits is 2419200, while the sum is 50.

The spelling of 42389575421 in words is "forty-two billion, three hundred eighty-nine million, five hundred seventy-five thousand, four hundred twenty-one".