251121141005 has 48 divisors (see below), whose sum is σ = 368391893760. Its totient is φ = 163646759808.

The previous prime is 251121140999. The next prime is 251121141023. The reversal of 251121141005 is 500141121152.

It is a happy number.

It is not a de Polignac number, because 251121141005 - 2¹⁰ = 251121139981 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 67676 + ... + 711914.

It is an arithmetic number, because the mean of its divisors is an integer number (7674831120).

Almost surely, 2^251121141005 is an apocalyptic number.

It is an amenable number.

251121141005 is a deficient number, since it is larger than the sum of its proper divisors (117270752755).

251121141005 is a wasteful number, since it uses less digits than its factorization.

251121141005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 644338 (or 644331 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 23.

Adding to 251121141005 its reverse (500141121152), we get a palindrome (751262262157).

The spelling of 251121141005 in words is "two hundred fifty-one billion, one hundred twenty-one million, one hundred forty-one thousand, five".