251345121211 has 8 divisors (see below), whose sum is σ = 257200441344. Its totient is φ = 245490259560.

The previous prime is 251345121197. The next prime is 251345121233. The reversal of 251345121211 is 112121543152.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 251345121211 - 2⁵ = 251345121179 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 251345121211.

It is not an unprimeable number, because it can be changed into a prime (251345124211) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1156950 + ... + 1356916.

It is an arithmetic number, because the mean of its divisors is an integer number (32150055168).

Almost surely, 2^251345121211 is an apocalyptic number.

251345121211 is a deficient number, since it is larger than the sum of its proper divisors (5855320133).

251345121211 is a wasteful number, since it uses less digits than its factorization.

251345121211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 229241.

The product of its digits is 2400, while the sum is 28.

Adding to 251345121211 its reverse (112121543152), we get a palindrome (363466664363).

The spelling of 251345121211 in words is "two hundred fifty-one billion, three hundred forty-five million, one hundred twenty-one thousand, two hundred eleven".