425451511421 has 4 divisors (see below), whose sum is σ = 426188862972. Its totient is φ = 424714159872.

The previous prime is 425451511403. The next prime is 425451511487. The reversal of 425451511421 is 124115154524.

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 344234491225 + 81217020196 = 586715^2 + 284986^2 .

It is a cyclic number.

It is not a de Polignac number, because 425451511421 - 2⁶ = 425451511357 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (425051511421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 368674910 + ... + 368676063.

It is an arithmetic number, because the mean of its divisors is an integer number (106547215743).

Almost surely, 2^425451511421 is an apocalyptic number.

It is an amenable number.

425451511421 is a deficient number, since it is larger than the sum of its proper divisors (737351551).

425451511421 is an equidigital number, since it uses as much as digits as its factorization.

425451511421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 737351550.

The product of its digits is 32000, while the sum is 35.

Adding to 425451511421 its reverse (124115154524), we get a palindrome (549566665945).

The spelling of 425451511421 in words is "four hundred twenty-five billion, four hundred fifty-one million, five hundred eleven thousand, four hundred twenty-one".