251112452121 has 12 divisors (see below), whose sum is σ = 384054338772. Its totient is φ = 157560754176.

The previous prime is 251112452083. The next prime is 251112452141. The reversal of 251112452121 is 121254211152.

251112452121 is a `hidden beast` number, since 2 + 5 + 1 + 112 + 4 + 521 + 21 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 184525230096 + 66587222025 = 429564^2 + 258045^2 .

It is not a de Polignac number, because 251112452121 - 2⁹ = 251112451609 is a prime.

It is a super-2 number, since 2×251112452121² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (251112452141) 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 11 ways as a sum of consecutive naturals, for example, 820628776 + ... + 820629081.

It is an arithmetic number, because the mean of its divisors is an integer number (32004528231).

Almost surely, 2^251112452121 is an apocalyptic number.

It is an amenable number.

251112452121 is a deficient number, since it is larger than the sum of its proper divisors (132941886651).

251112452121 is a wasteful number, since it uses less digits than its factorization.

251112452121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1641257880 (or 1641257877 counting only the distinct ones).

The product of its digits is 1600, while the sum is 27.

Adding to 251112452121 its reverse (121254211152), we get a palindrome (372366663273).

The spelling of 251112452121 in words is "two hundred fifty-one billion, one hundred twelve million, four hundred fifty-two thousand, one hundred twenty-one".