25315245451221 has 32 divisors (see below), whose sum is σ = 37728120342528. Its totient is φ = 14967222503040.

The previous prime is 25315245451207. The next prime is 25315245451277. The reversal of 25315245451221 is 12215454251352.

It is not a de Polignac number, because 25315245451221 - 2²¹ = 25315243354069 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25315245401221) 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 31 ways as a sum of consecutive naturals, for example, 26106720 + ... + 27059033.

It is an arithmetic number, because the mean of its divisors is an integer number (1179003760704).

Almost surely, 2^{25315245451221} is an apocalyptic number.

It is an amenable number.

25315245451221 is a deficient number, since it is larger than the sum of its proper divisors (12412874891307).

25315245451221 is a wasteful number, since it uses less digits than its factorization.

25315245451221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53166121.

The product of its digits is 480000, while the sum is 42.

The spelling of 25315245451221 in words is "twenty-five trillion, three hundred fifteen billion, two hundred forty-five million, four hundred fifty-one thousand, two hundred twenty-one".