2071220786881 has 4 divisors (see below), whose sum is σ = 2071468282500. Its totient is φ = 2070973291264.

The previous prime is 2071220786837. The next prime is 2071220786891. The reversal of 2071220786881 is 1886870221702.

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

It can be written as a sum of positive squares in 2 ways, for example, as 648735204481 + 1422485582400 = 805441^2 + 1192680^2 .

It is a cyclic number.

It is not a de Polignac number, because 2071220786881 - 2²³ = 2071212398273 is a prime.

It is a super-2 number, since 2×2071220786881² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2071220786891) 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, 123735256 + ... + 123751993.

It is an arithmetic number, because the mean of its divisors is an integer number (517867070625).

Almost surely, 2^{2071220786881} is an apocalyptic number.

It is an amenable number.

2071220786881 is a deficient number, since it is larger than the sum of its proper divisors (247495619).

2071220786881 is an equidigital number, since it uses as much as digits as its factorization.

2071220786881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 247495618.

The product of its (nonzero) digits is 1204224, while the sum is 52.

The spelling of 2071220786881 in words is "two trillion, seventy-one billion, two hundred twenty million, seven hundred eighty-six thousand, eight hundred eighty-one".