1201421257 has 2 divisors, whose sum is σ = 1201421258. Its totient is φ = 1201421256.

The previous prime is 1201421239. The next prime is 1201421303. The reversal of 1201421257 is 7521241021.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 922397641 + 279023616 = 30371^2 + 16704^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1201421257 is a prime.

It is not a weakly prime, because it can be changed into another prime (1201421227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 600710628 + 600710629.

It is an arithmetic number, because the mean of its divisors is an integer number (600710629).

Almost surely, 2^1201421257 is an apocalyptic number.

It is an amenable number.

1201421257 is a deficient number, since it is larger than the sum of its proper divisors (1).

1201421257 is an equidigital number, since it uses as much as digits as its factorization.

1201421257 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1120, while the sum is 25.

The square root of 1201421257 is about 34661.5241586402. The cubic root of 1201421257 is about 1063.0779344773.

Adding to 1201421257 its reverse (7521241021), we get a palindrome (8722662278).

The spelling of 1201421257 in words is "one billion, two hundred one million, four hundred twenty-one thousand, two hundred fifty-seven".