211231403 has 2 divisors, whose sum is σ = 211231404. Its totient is φ = 211231402.

The previous prime is 211231381. The next prime is 211231429. The reversal of 211231403 is 304132112.

211231403 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 211231403 - 2⁸ = 211231147 is a prime.

It is a super-2 number, since 2×211231403² = 89237411226696818, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (211231463) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105615701 + 105615702.

It is an arithmetic number, because the mean of its divisors is an integer number (105615702).

Almost surely, 2^211231403 is an apocalyptic number.

211231403 is a deficient number, since it is larger than the sum of its proper divisors (1).

211231403 is an equidigital number, since it uses as much as digits as its factorization.

211231403 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 211231403 is about 14533.8020834192. The cubic root of 211231403 is about 595.5517354768.

Adding to 211231403 its reverse (304132112), we get a palindrome (515363515).

The spelling of 211231403 in words is "two hundred eleven million, two hundred thirty-one thousand, four hundred three".