1000221251 has 2 divisors, whose sum is σ = 1000221252. Its totient is φ = 1000221250.

The previous prime is 1000221221. The next prime is 1000221319. The reversal of 1000221251 is 1521220001.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1000221251 is a prime.

It is not a weakly prime, because it can be changed into another prime (1000221221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500110625 + 500110626.

It is an arithmetic number, because the mean of its divisors is an integer number (500110626).

Almost surely, 2^1000221251 is an apocalyptic number.

1000221251 is a deficient number, since it is larger than the sum of its proper divisors (1).

1000221251 is an equidigital number, since it uses as much as digits as its factorization.

1000221251 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40, while the sum is 14.

The square root of 1000221251 is about 31626.2746936784. The cubic root of 1000221251 is about 1000.0737448949.

Adding to 1000221251 its reverse (1521220001), we get a palindrome (2521441252).

The spelling of 1000221251 in words is "one billion, two hundred twenty-one thousand, two hundred fifty-one".