211431401 has 4 divisors (see below), whose sum is σ = 211478400. Its totient is φ = 211384404.

The previous prime is 211431361. The next prime is 211431403. The reversal of 211431401 is 104134112.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211431401 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 211431401.

It is not an unprimeable number, because it can be changed into a prime (211431403) 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, 15941 + ... + 26018.

It is an arithmetic number, because the mean of its divisors is an integer number (52869600).

Almost surely, 2^211431401 is an apocalyptic number.

It is an amenable number.

211431401 is a deficient number, since it is larger than the sum of its proper divisors (46999).

211431401 is an equidigital number, since it uses as much as digits as its factorization.

211431401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46998.

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 211431401 is about 14540.6808987750. The cubic root of 211431401 is about 595.7396361747.

Adding to 211431401 its reverse (104134112), we get a palindrome (315565513).

The spelling of 211431401 in words is "two hundred eleven million, four hundred thirty-one thousand, four hundred one".