211230031 has 4 divisors (see below), whose sum is σ = 213280912. Its totient is φ = 209179152.

The previous prime is 211230023. The next prime is 211230037. The reversal of 211230031 is 130032112.

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 211230031 - 2³ = 211230023 is a prime.

It is a super-2 number, since 2×211230031² = 89236251992521922, 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 = 211229993 and 211230020.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211230037) 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, 1025286 + ... + 1025491.

It is an arithmetic number, because the mean of its divisors is an integer number (53320228).

Almost surely, 2^211230031 is an apocalyptic number.

211230031 is a deficient number, since it is larger than the sum of its proper divisors (2050881).

211230031 is a wasteful number, since it uses less digits than its factorization.

211230031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2050880.

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 211230031 is about 14533.7548830301. The cubic root of 211230031 is about 595.5504460556.

Adding to 211230031 its reverse (130032112), we get a palindrome (341262143).

The spelling of 211230031 in words is "two hundred eleven million, two hundred thirty thousand, thirty-one".