211331401 has 2 divisors, whose sum is σ = 211331402. Its totient is φ = 211331400.

The previous prime is 211331387. The next prime is 211331413. The reversal of 211331401 is 104133112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 156275001 + 55056400 = 12501^2 + 7420^2 .

It is a cyclic number.

It is not a de Polignac number, because 211331401 - 2⁷ = 211331273 is a prime.

It is a super-2 number, since 2×211331401² = 89321922097245602, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (211331431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105665700 + 105665701.

It is an arithmetic number, because the mean of its divisors is an integer number (105665701).

Almost surely, 2^211331401 is an apocalyptic number.

It is an amenable number.

211331401 is a deficient number, since it is larger than the sum of its proper divisors (1).

211331401 is an equidigital number, since it uses as much as digits as its factorization.

211331401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 211331401 is about 14537.2418635723. The cubic root of 211331401 is about 595.6456997049.

Adding to 211331401 its reverse (104133112), we get a palindrome (315464513).

The spelling of 211331401 in words is "two hundred eleven million, three hundred thirty-one thousand, four hundred one".