251146421 has 8 divisors (see below), whose sum is σ = 255752640. Its totient is φ = 246551968.

The previous prime is 251146411. The next prime is 251146429. The reversal of 251146421 is 124641152.

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 251146421 - 2¹⁴ = 251130037 is a prime.

It is a super-2 number, since 2×251146421² = 126149049562218482, which 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 (251146429) 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, 48080 + ... + 53046.

It is an arithmetic number, because the mean of its divisors is an integer number (31969080).

Almost surely, 2^251146421 is an apocalyptic number.

It is an amenable number.

251146421 is a deficient number, since it is larger than the sum of its proper divisors (4606219).

251146421 is an equidigital number, since it uses as much as digits as its factorization.

251146421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5883.

The product of its digits is 1920, while the sum is 26.

The square root of 251146421 is about 15847.5998498195. The cubic root of 251146421 is about 630.9219900832.

Adding to 251146421 its reverse (124641152), we get a palindrome (375787573).

The spelling of 251146421 in words is "two hundred fifty-one million, one hundred forty-six thousand, four hundred twenty-one".