251050421 has 8 divisors (see below), whose sum is σ = 257594904. Its totient is φ = 244526080.

The previous prime is 251050417. The next prime is 251050427. The reversal of 251050421 is 124050152.

It can be written as a sum of positive squares in 4 ways, for example, as 15888196 + 235162225 = 3986^2 + 15335^2 .

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 251050421 - 2² = 251050417 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 251050393 and 251050402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251050427) 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 7 ways as a sum of consecutive naturals, for example, 22085 + ... + 31461.

It is an arithmetic number, because the mean of its divisors is an integer number (32199363).

Almost surely, 2^251050421 is an apocalyptic number.

It is an amenable number.

251050421 is a deficient number, since it is larger than the sum of its proper divisors (6544483).

251050421 is an equidigital number, since it uses as much as digits as its factorization.

251050421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10071.

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 251050421 is about 15844.5707104989. The cubic root of 251050421 is about 630.8415904637.

The spelling of 251050421 in words is "two hundred fifty-one million, fifty thousand, four hundred twenty-one".