12771220020 has 48 divisors (see below), whose sum is σ = 38510142720. Its totient is φ = 3143684736.

The previous prime is 12771220019. The next prime is 12771220057. The reversal of 12771220020 is 2002217721.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8185900 + ... + 8187459.

It is an arithmetic number, because the mean of its divisors is an integer number (802294640).

Almost surely, 2^12771220020 is an apocalyptic number.

12771220020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12771220020 is an abundant number, since it is smaller than the sum of its proper divisors (25738922700).

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

12771220020 is a wasteful number, since it uses less digits than its factorization.

12771220020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16373384 (or 16373382 counting only the distinct ones).

The product of its (nonzero) digits is 784, while the sum is 24.

Adding to 12771220020 its reverse (2002217721), we get a palindrome (14773437741).

The spelling of 12771220020 in words is "twelve billion, seven hundred seventy-one million, two hundred twenty thousand, twenty".