1273420851971 has 4 divisors (see below), whose sum is σ = 1307837631792. Its totient is φ = 1239004072152.

The previous prime is 1273420851953. The next prime is 1273420851973. The reversal of 1273420851971 is 1791580243721.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1273420851971 - 2¹⁸ = 1273420589827 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1273420851973) 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 3 ways as a sum of consecutive naturals, for example, 17208389855 + ... + 17208389928.

It is an arithmetic number, because the mean of its divisors is an integer number (326959407948).

Almost surely, 2^{1273420851971} is an apocalyptic number.

1273420851971 is a deficient number, since it is larger than the sum of its proper divisors (34416779821).

1273420851971 is an equidigital number, since it uses as much as digits as its factorization.

1273420851971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34416779820.

The product of its (nonzero) digits is 846720, while the sum is 50.

The spelling of 1273420851971 in words is "one trillion, two hundred seventy-three billion, four hundred twenty million, eight hundred fifty-one thousand, nine hundred seventy-one".