251051221532 has 12 divisors (see below), whose sum is σ = 439343191560. Its totient is φ = 125524595376.

The previous prime is 251051221529. The next prime is 251051221537. The reversal of 251051221532 is 235122150152.

It is a happy number.

251051221532 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 251051221495 and 251051221504.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251051221537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 704243 + ... + 999029.

It is an arithmetic number, because the mean of its divisors is an integer number (36611932630).

Almost surely, 2^251051221532 is an apocalyptic number.

It is an amenable number.

251051221532 is a deficient number, since it is larger than the sum of its proper divisors (188291970028).

251051221532 is a wasteful number, since it uses less digits than its factorization.

251051221532 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 507700 (or 507698 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 29.

Adding to 251051221532 its reverse (235122150152), we get a palindrome (486173371684).

The spelling of 251051221532 in words is "two hundred fifty-one billion, fifty-one million, two hundred twenty-one thousand, five hundred thirty-two".