25212325343221 has 4 divisors (see below), whose sum is σ = 25234192061932. Its totient is φ = 25190458624512.

The previous prime is 25212325343159. The next prime is 25212325343237. The reversal of 25212325343221 is 12234352321252.

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 19544259550321 + 5668065792900 = 4420889^2 + 2380770^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25212325343221 is a prime.

It is a super-3 number, since 3×25212325343221³ (a number of 41 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25212325343321) 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, 10933357626 + ... + 10933359931.

It is an arithmetic number, because the mean of its divisors is an integer number (6308548015483).

Almost surely, 2^{25212325343221} is an apocalyptic number.

It is an amenable number.

25212325343221 is a deficient number, since it is larger than the sum of its proper divisors (21866718711).

25212325343221 is a wasteful number, since it uses less digits than its factorization.

25212325343221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21866718710.

The product of its digits is 172800, while the sum is 37.

Adding to 25212325343221 its reverse (12234352321252), we get a palindrome (37446677664473).

The spelling of 25212325343221 in words is "twenty-five trillion, two hundred twelve billion, three hundred twenty-five million, three hundred forty-three thousand, two hundred twenty-one".