425440440121 has 4 divisors (see below), whose sum is σ = 425442399732. Its totient is φ = 425438480512.

The previous prime is 425440440119. The next prime is 425440440127. The reversal of 425440440121 is 121044044524.

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 206060615721 + 219379824400 = 453939^2 + 468380^2 .

It is a cyclic number.

It is not a de Polignac number, because 425440440121 - 2¹ = 425440440119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (425440440127) 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, 606820 + ... + 1104133.

It is an arithmetic number, because the mean of its divisors is an integer number (106360599933).

Almost surely, 2^425440440121 is an apocalyptic number.

It is an amenable number.

425440440121 is a deficient number, since it is larger than the sum of its proper divisors (1959611).

425440440121 is a wasteful number, since it uses less digits than its factorization.

425440440121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1959610.

The product of its (nonzero) digits is 20480, while the sum is 31.

Adding to 425440440121 its reverse (121044044524), we get a palindrome (546484484645).

The spelling of 425440440121 in words is "four hundred twenty-five billion, four hundred forty million, four hundred forty thousand, one hundred twenty-one".