211320123331 has 4 divisors (see below), whose sum is σ = 213190213032. Its totient is φ = 209450033632.

The previous prime is 211320123293. The next prime is 211320123353. The reversal of 211320123331 is 133321023112.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211320123331 is a prime.

It is a super-2 number, since 2×211320123331² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (211320123731) 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, 935044681 + ... + 935044906.

It is an arithmetic number, because the mean of its divisors is an integer number (53297553258).

Almost surely, 2^211320123331 is an apocalyptic number.

211320123331 is a deficient number, since it is larger than the sum of its proper divisors (1870089701).

211320123331 is a wasteful number, since it uses less digits than its factorization.

211320123331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1870089700.

The product of its (nonzero) digits is 648, while the sum is 22.

Adding to 211320123331 its reverse (133321023112), we get a palindrome (344641146443).

The spelling of 211320123331 in words is "two hundred eleven billion, three hundred twenty million, one hundred twenty-three thousand, three hundred thirty-one".