42025121399 has 4 divisors (see below), whose sum is σ = 42242868336. Its totient is φ = 41807374464.

The previous prime is 42025121389. The next prime is 42025121429. The reversal of 42025121399 is 99312152024.

It is a happy number.

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 42025121399 - 2³² = 37730154103 is a prime.

It is a super-2 number, since 2×42025121399² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42025121389) 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, 108873179 + ... + 108873564.

It is an arithmetic number, because the mean of its divisors is an integer number (10560717084).

Almost surely, 2^42025121399 is an apocalyptic number.

42025121399 is a deficient number, since it is larger than the sum of its proper divisors (217746937).

42025121399 is a wasteful number, since it uses less digits than its factorization.

42025121399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217746936.

The product of its (nonzero) digits is 38880, while the sum is 38.

The spelling of 42025121399 in words is "forty-two billion, twenty-five million, one hundred twenty-one thousand, three hundred ninety-nine".