1321613011 has 4 divisors (see below), whose sum is σ = 1321817224. Its totient is φ = 1321408800.

The previous prime is 1321612937. The next prime is 1321613017. The reversal of 1321613011 is 1103161231.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1103161231 = 67 ⋅16465093.

It is a cyclic number.

It is not a de Polignac number, because 1321613011 - 2¹¹ = 1321610963 is a prime.

It is a super-2 number, since 2×1321613011² = 3493321901688972242, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1321613011.

It is not an unprimeable number, because it can be changed into a prime (1321613017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 92070 + ... + 105451.

It is an arithmetic number, because the mean of its divisors is an integer number (330454306).

Almost surely, 2^1321613011 is an apocalyptic number.

1321613011 is a deficient number, since it is larger than the sum of its proper divisors (204213).

1321613011 is an equidigital number, since it uses as much as digits as its factorization.

1321613011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204212.

The product of its (nonzero) digits is 108, while the sum is 19.

The square root of 1321613011 is about 36353.9958051381. The cubic root of 1321613011 is about 1097.4079494821.

Adding to 1321613011 its reverse (1103161231), we get a palindrome (2424774242).

The spelling of 1321613011 in words is "one billion, three hundred twenty-one million, six hundred thirteen thousand, eleven".