211383640331 has 4 divisors (see below), whose sum is σ = 211390056000. Its totient is φ = 211377224664.

The previous prime is 211383640297. The next prime is 211383640333. The reversal of 211383640331 is 133046383112.

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-211383640331 is a prime.

It is a super-2 number, since 2×211383640331² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211383640291 and 211383640300.

It is not an unprimeable number, because it can be changed into a prime (211383640333) 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, 3158156 + ... + 3224393.

It is an arithmetic number, because the mean of its divisors is an integer number (52847514000).

Almost surely, 2^211383640331 is an apocalyptic number.

211383640331 is a deficient number, since it is larger than the sum of its proper divisors (6415669).

211383640331 is an equidigital number, since it uses as much as digits as its factorization.

211383640331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6415668.

The product of its (nonzero) digits is 31104, while the sum is 35.

The spelling of 211383640331 in words is "two hundred eleven billion, three hundred eighty-three million, six hundred forty thousand, three hundred thirty-one".