1601210621311 has 4 divisors (see below), whose sum is σ = 1829954995792. Its totient is φ = 1372466246832.

The previous prime is 1601210621299. The next prime is 1601210621393. The reversal of 1601210621311 is 1131260121061.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1601210621311 - 2⁵ = 1601210621279 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1601210621711) 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, 114372187230 + ... + 114372187243.

It is an arithmetic number, because the mean of its divisors is an integer number (457488748948).

Almost surely, 2^{1601210621311} is an apocalyptic number.

1601210621311 is a deficient number, since it is larger than the sum of its proper divisors (228744374481).

1601210621311 is an equidigital number, since it uses as much as digits as its factorization.

1601210621311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 228744374480.

The product of its (nonzero) digits is 432, while the sum is 25.

Adding to 1601210621311 its reverse (1131260121061), we get a palindrome (2732470742372).

The spelling of 1601210621311 in words is "one trillion, six hundred one billion, two hundred ten million, six hundred twenty-one thousand, three hundred eleven".