1611202211321 has 4 divisors (see below), whose sum is σ = 1611210873444. Its totient is φ = 1611193549200.

The previous prime is 1611202211299. The next prime is 1611202211323. The reversal of 1611202211321 is 1231122021161.

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 1086620692921 + 524581518400 = 1042411^2 + 724280^2 .

It is a cyclic number.

It is not a de Polignac number, because 1611202211321 - 2⁶ = 1611202211257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1611202211323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4045790 + ... + 4426151.

It is an arithmetic number, because the mean of its divisors is an integer number (402802718361).

Almost surely, 2^{1611202211321} is an apocalyptic number.

It is an amenable number.

1611202211321 is a deficient number, since it is larger than the sum of its proper divisors (8662123).

1611202211321 is an equidigital number, since it uses as much as digits as its factorization.

1611202211321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8662122.

The product of its (nonzero) digits is 288, while the sum is 23.

Adding to 1611202211321 its reverse (1231122021161), we get a palindrome (2842324232482).

The spelling of 1611202211321 in words is "one trillion, six hundred eleven billion, two hundred two million, two hundred eleven thousand, three hundred twenty-one".