251532051421 has 8 divisors (see below), whose sum is σ = 287553651264. Its totient is φ = 215532564000.

The previous prime is 251532051383. The next prime is 251532051457. The reversal of 251532051421 is 124150235152.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 251532051421 - 2¹⁵ = 251532018653 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251532051481) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5503720 + ... + 5549233.

It is an arithmetic number, because the mean of its divisors is an integer number (35944206408).

Almost surely, 2^251532051421 is an apocalyptic number.

It is an amenable number.

251532051421 is a deficient number, since it is larger than the sum of its proper divisors (36021599843).

251532051421 is a wasteful number, since it uses less digits than its factorization.

251532051421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11056211.

The product of its (nonzero) digits is 12000, while the sum is 31.

Adding to 251532051421 its reverse (124150235152), we get a palindrome (375682286573).

The spelling of 251532051421 in words is "two hundred fifty-one billion, five hundred thirty-two million, fifty-one thousand, four hundred twenty-one".