211226399 has 2 divisors, whose sum is σ = 211226400. Its totient is φ = 211226398.

The previous prime is 211226381. The next prime is 211226419. The reversal of 211226399 is 993622112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 211226399 - 2¹² = 211222303 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211226339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105613199 + 105613200.

It is an arithmetic number, because the mean of its divisors is an integer number (105613200).

Almost surely, 2^211226399 is an apocalyptic number.

211226399 is a deficient number, since it is larger than the sum of its proper divisors (1).

211226399 is an equidigital number, since it uses as much as digits as its factorization.

211226399 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11664, while the sum is 35.

The square root of 211226399 is about 14533.6299319888. The cubic root of 211226399 is about 595.5470326338.

The spelling of 211226399 in words is "two hundred eleven million, two hundred twenty-six thousand, three hundred ninety-nine".