1221031031013 has 10 divisors (see below), whose sum is σ = 1824009318054. Its totient is φ = 814020687288.

The previous prime is 1221031030997. The next prime is 1221031031047. The reversal of 1221031031013 is 3101301301221.

1221031031013 is a `hidden beast` number, since 1 + 22 + 10 + 310 + 310 + 13 = 666.

It can be written as a sum of positive squares in only one way, i.e., 662779976769 + 558251054244 = 814113^2 + 747162^2 .

It is not a de Polignac number, because 1221031031013 - 2⁴ = 1221031030997 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221031031083) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 7537228506 + ... + 7537228667.

Almost surely, 2^{1221031031013} is an apocalyptic number.

It is an amenable number.

1221031031013 is a deficient number, since it is larger than the sum of its proper divisors (602978287041).

1221031031013 is an equidigital number, since it uses as much as digits as its factorization.

1221031031013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15074457185 (or 15074457176 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

Adding to 1221031031013 its reverse (3101301301221), we get a palindrome (4322332332234).

The spelling of 1221031031013 in words is "one trillion, two hundred twenty-one billion, thirty-one million, thirty-one thousand, thirteen".