251230115421 has 12 divisors (see below), whose sum is σ = 369734887548. Its totient is φ = 164326616064.

The previous prime is 251230115413. The next prime is 251230115443. The reversal of 251230115421 is 124511032152.

It is a happy number.

251230115421 is a `hidden beast` number, since 2 + 5 + 1 + 230 + 1 + 1 + 5 + 421 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 124076540025 + 127153575396 = 352245^2 + 356586^2 .

It is not a de Polignac number, because 251230115421 - 2³ = 251230115413 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251230115221) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 263343460 + ... + 263344413.

It is an arithmetic number, because the mean of its divisors is an integer number (30811240629).

Almost surely, 2^251230115421 is an apocalyptic number.

It is an amenable number.

251230115421 is a deficient number, since it is larger than the sum of its proper divisors (118504772127).

251230115421 is a wasteful number, since it uses less digits than its factorization.

251230115421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 526687932 (or 526687929 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 27.

Adding to 251230115421 its reverse (124511032152), we get a palindrome (375741147573).

The spelling of 251230115421 in words is "two hundred fifty-one billion, two hundred thirty million, one hundred fifteen thousand, four hundred twenty-one".