1421736643257 has 8 divisors (see below), whose sum is σ = 2166455837376. Its totient is φ = 812420938992.

The previous prime is 1421736643207. The next prime is 1421736643289. The reversal of 1421736643257 is 7523466371241.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1421736643257 - 2⁸ = 1421736643001 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1421736643207) 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, 33850872438 + ... + 33850872479.

It is an arithmetic number, because the mean of its divisors is an integer number (270806979672).

Almost surely, 2^{1421736643257} is an apocalyptic number.

It is an amenable number.

1421736643257 is a deficient number, since it is larger than the sum of its proper divisors (744719194119).

1421736643257 is an equidigital number, since it uses as much as digits as its factorization.

1421736643257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67701744927.

The product of its digits is 5080320, while the sum is 51.

The spelling of 1421736643257 in words is "one trillion, four hundred twenty-one billion, seven hundred thirty-six million, six hundred forty-three thousand, two hundred fifty-seven".