211520447 has 2 divisors, whose sum is σ = 211520448. Its totient is φ = 211520446.

The previous prime is 211520411. The next prime is 211520459. The reversal of 211520447 is 744025112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 211520447 - 2¹² = 211516351 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211520747) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105760223 + 105760224.

It is an arithmetic number, because the mean of its divisors is an integer number (105760224).

Almost surely, 2^211520447 is an apocalyptic number.

211520447 is a deficient number, since it is larger than the sum of its proper divisors (1).

211520447 is an equidigital number, since it uses as much as digits as its factorization.

211520447 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2240, while the sum is 26.

The square root of 211520447 is about 14543.7425376001. The cubic root of 211520447 is about 595.8232579167.

Adding to 211520447 its reverse (744025112), we get a palindrome (955545559).

The spelling of 211520447 in words is "two hundred eleven million, five hundred twenty thousand, four hundred forty-seven".