21425445263 has 4 divisors (see below), whose sum is σ = 21646326240. Its totient is φ = 21204564288.

The previous prime is 21425445241. The next prime is 21425445271. The reversal of 21425445263 is 36254452412.

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 21425445263 - 2⁸ = 21425445007 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 (21425445163) 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, 110440343 + ... + 110440536.

It is an arithmetic number, because the mean of its divisors is an integer number (5411581560).

Almost surely, 2^21425445263 is an apocalyptic number.

21425445263 is a deficient number, since it is larger than the sum of its proper divisors (220880977).

21425445263 is an equidigital number, since it uses as much as digits as its factorization.

21425445263 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 220880976.

The product of its digits is 230400, while the sum is 38.

Adding to 21425445263 its reverse (36254452412), we get a palindrome (57679897675).

The spelling of 21425445263 in words is "twenty-one billion, four hundred twenty-five million, four hundred forty-five thousand, two hundred sixty-three".