1421403257 has 2 divisors, whose sum is σ = 1421403258. Its totient is φ = 1421403256.

The previous prime is 1421403253. The next prime is 1421403259. The reversal of 1421403257 is 7523041241.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 900240016 + 521163241 = 30004^2 + 22829^2 .

It is a cyclic number.

It is not a de Polignac number, because 1421403257 - 2² = 1421403253 is a prime.

Together with 1421403259, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1421403253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 710701628 + 710701629.

It is an arithmetic number, because the mean of its divisors is an integer number (710701629).

Almost surely, 2^1421403257 is an apocalyptic number.

It is an amenable number.

1421403257 is a deficient number, since it is larger than the sum of its proper divisors (1).

1421403257 is an equidigital number, since it uses as much as digits as its factorization.

1421403257 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6720, while the sum is 29.

The square root of 1421403257 is about 37701.5020523056. The cubic root of 1421403257 is about 1124.3609887418.

Adding to 1421403257 its reverse (7523041241), we get a palindrome (8944444498).

The spelling of 1421403257 in words is "one billion, four hundred twenty-one million, four hundred three thousand, two hundred fifty-seven".