251250201421 has 16 divisors (see below), whose sum is σ = 279714619440. Its totient is φ = 224573690880.

The previous prime is 251250201403. The next prime is 251250201431. The reversal of 251250201421 is 124102052152.

It can be written as a sum of positive squares in 8 ways, for example, as 484616196 + 250765585225 = 22014^2 + 500765^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-251250201421 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 (251250201431) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4147266 + ... + 4207411.

It is an arithmetic number, because the mean of its divisors is an integer number (17482163715).

Almost surely, 2^251250201421 is an apocalyptic number.

It is an amenable number.

251250201421 is a deficient number, since it is larger than the sum of its proper divisors (28464418019).

251250201421 is a wasteful number, since it uses less digits than its factorization.

251250201421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8354784.

The product of its (nonzero) digits is 1600, while the sum is 25.

Adding to 251250201421 its reverse (124102052152), we get a palindrome (375352253573).

The spelling of 251250201421 in words is "two hundred fifty-one billion, two hundred fifty million, two hundred one thousand, four hundred twenty-one".