1321503111061 has 32 divisors (see below), whose sum is σ = 1620383304960. Its totient is φ = 1052637659136.

The previous prime is 1321503111041. The next prime is 1321503111073. The reversal of 1321503111061 is 1601113051231.

It is not a de Polignac number, because 1321503111061 - 2¹⁷ = 1321502979989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321503111011) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1004565 + ... + 1911061.

It is an arithmetic number, because the mean of its divisors is an integer number (50636978280).

Almost surely, 2^{1321503111061} is an apocalyptic number.

It is an amenable number.

1321503111061 is a deficient number, since it is larger than the sum of its proper divisors (298880193899).

1321503111061 is a wasteful number, since it uses less digits than its factorization.

1321503111061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 906733.

The product of its (nonzero) digits is 540, while the sum is 25.

Adding to 1321503111061 its reverse (1601113051231), we get a palindrome (2922616162292).

The spelling of 1321503111061 in words is "one trillion, three hundred twenty-one billion, five hundred three million, one hundred eleven thousand, sixty-one".