1271121797020 has 12 divisors (see below), whose sum is σ = 2669355773784. Its totient is φ = 508448718800.

The previous prime is 1271121796981. The next prime is 1271121797059. The reversal of 1271121797020 is 207971211721.

It is an interprime number because it is at equal distance from previous prime (1271121796981) and next prime (1271121797059).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31778044906 + ... + 31778044945.

It is an arithmetic number, because the mean of its divisors is an integer number (222446314482).

Almost surely, 2^{1271121797020} is an apocalyptic number.

1271121797020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1271121797020 is an abundant number, since it is smaller than the sum of its proper divisors (1398233976764).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1271121797020 is a wasteful number, since it uses less digits than its factorization.

1271121797020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63556089860 (or 63556089858 counting only the distinct ones).

The product of its (nonzero) digits is 24696, while the sum is 40.

The spelling of 1271121797020 in words is "one trillion, two hundred seventy-one billion, one hundred twenty-one million, seven hundred ninety-seven thousand, twenty".