1220221131013 has 4 divisors (see below), whose sum is σ = 1291998844620. Its totient is φ = 1148443417408.

The previous prime is 1220221130993. The next prime is 1220221131139. The reversal of 1220221131013 is 3101311220221.

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 556871152644 + 663349978369 = 746238^2 + 814463^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1220221131013 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220221131313) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35888856778 + ... + 35888856811.

It is an arithmetic number, because the mean of its divisors is an integer number (322999711155).

Almost surely, 2^{1220221131013} is an apocalyptic number.

It is an amenable number.

1220221131013 is a deficient number, since it is larger than the sum of its proper divisors (71777713607).

1220221131013 is an equidigital number, since it uses as much as digits as its factorization.

1220221131013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71777713606.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 1220221131013 its reverse (3101311220221), we get a palindrome (4321532351234).

The spelling of 1220221131013 in words is "one trillion, two hundred twenty billion, two hundred twenty-one million, one hundred thirty-one thousand, thirteen".