211120031 has 4 divisors (see below), whose sum is σ = 212340552. Its totient is φ = 209899512.

The previous prime is 211120009. The next prime is 211120033. The reversal of 211120031 is 130021112.

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-211120031 is a prime.

It is a super-2 number, since 2×211120031² = 89143334978881922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211119994 and 211120021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211120033) 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, 610001 + ... + 610346.

It is an arithmetic number, because the mean of its divisors is an integer number (53085138).

Almost surely, 2^211120031 is an apocalyptic number.

211120031 is a deficient number, since it is larger than the sum of its proper divisors (1220521).

211120031 is a wasteful number, since it uses less digits than its factorization.

211120031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1220520.

The product of its (nonzero) digits is 12, while the sum is 11.

The square root of 211120031 is about 14529.9700963216. The cubic root of 211120031 is about 595.4470486303.

Adding to 211120031 its reverse (130021112), we get a palindrome (341141143).

The spelling of 211120031 in words is "two hundred eleven million, one hundred twenty thousand, thirty-one".