251221042322351 has 8 divisors (see below), whose sum is σ = 279998684941680. Its totient is φ = 223998947952768.

The previous prime is 251221042322323. The next prime is 251221042322357. The reversal of 251221042322351 is 153223240122152.

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

It is not a de Polignac number, because 251221042322351 - 2¹⁸ = 251221042060207 is a prime.

It is a super-2 number, since 2×251221042322351² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251221042322357) 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, 388887062096 + ... + 388887062741.

It is an arithmetic number, because the mean of its divisors is an integer number (34999835617710).

Almost surely, 2^{251221042322351} is an apocalyptic number.

251221042322351 is a deficient number, since it is larger than the sum of its proper divisors (28777642619329).

251221042322351 is a wasteful number, since it uses less digits than its factorization.

251221042322351 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 777774124873.

The product of its (nonzero) digits is 57600, while the sum is 35.

The spelling of 251221042322351 in words is "two hundred fifty-one trillion, two hundred twenty-one billion, forty-two million, three hundred twenty-two thousand, three hundred fifty-one".