211442331 has 16 divisors (see below), whose sum is σ = 291990528. Its totient is φ = 136012800.

The previous prime is 211442327. The next prime is 211442333. The reversal of 211442331 is 133244112.

It is not a de Polignac number, because 211442331 - 2² = 211442327 is a prime.

It is a super-2 number, since 2×211442331² = 89415718677427122, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 211442298 and 211442307.

It is not an unprimeable number, because it can be changed into a prime (211442333) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 550 + ... + 20571.

It is an arithmetic number, because the mean of its divisors is an integer number (18249408).

Almost surely, 2^211442331 is an apocalyptic number.

211442331 is a deficient number, since it is larger than the sum of its proper divisors (80548197).

211442331 is a wasteful number, since it uses less digits than its factorization.

211442331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21242.

The product of its digits is 576, while the sum is 21.

The square root of 211442331 is about 14541.0567360148. The cubic root of 211442331 is about 595.7499016351.

Adding to 211442331 its reverse (133244112), we get a palindrome (344686443).

The spelling of 211442331 in words is "two hundred eleven million, four hundred forty-two thousand, three hundred thirty-one".