1271821324560 has 40 divisors (see below), whose sum is σ = 3942646106880. Its totient is φ = 339152353152.

The previous prime is 1271821324549. The next prime is 1271821324639. The reversal of 1271821324560 is 654231281721.

It is a tau number, because it is divible by the number of its divisors (40).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2649627520 + ... + 2649627999.

It is an arithmetic number, because the mean of its divisors is an integer number (98566152672).

Almost surely, 2^{1271821324560} is an apocalyptic number.

1271821324560 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1271821324560 is an abundant number, since it is smaller than the sum of its proper divisors (2670824782320).

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

1271821324560 is a wasteful number, since it uses less digits than its factorization.

1271821324560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5299255535 (or 5299255529 counting only the distinct ones).

The product of its (nonzero) digits is 161280, while the sum is 42.

The spelling of 1271821324560 in words is "one trillion, two hundred seventy-one billion, eight hundred twenty-one million, three hundred twenty-four thousand, five hundred sixty".