251212500422 has 16 divisors (see below), whose sum is σ = 406685098512. Its totient is φ = 115692719520.

The previous prime is 251212500391. The next prime is 251212500463. The reversal of 251212500422 is 224005212152.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a junction number, because it is equal to n+sod(n) for n = 251212500391 and 251212500400.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 10467428 + ... + 10491399.

It is an arithmetic number, because the mean of its divisors is an integer number (25417818657).

Almost surely, 2^251212500422 is an apocalyptic number.

251212500422 is a deficient number, since it is larger than the sum of its proper divisors (155472598090).

251212500422 is a wasteful number, since it uses less digits than its factorization.

251212500422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20959303.

The product of its (nonzero) digits is 3200, while the sum is 26.

Adding to 251212500422 its reverse (224005212152), we get a palindrome (475217712574).

The spelling of 251212500422 in words is "two hundred fifty-one billion, two hundred twelve million, five hundred thousand, four hundred twenty-two".