211719919 has 2 divisors, whose sum is σ = 211719920. Its totient is φ = 211719918.

The previous prime is 211719857. The next prime is 211719953. The reversal of 211719919 is 919917112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 211719919 - 2¹¹ = 211717871 is a prime.

It is a super-2 number, since 2×211719919² = 89650648202733122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211719419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105859959 + 105859960.

It is an arithmetic number, because the mean of its divisors is an integer number (105859960).

Almost surely, 2^211719919 is an apocalyptic number.

211719919 is a deficient number, since it is larger than the sum of its proper divisors (1).

211719919 is an equidigital number, since it uses as much as digits as its factorization.

211719919 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10206, while the sum is 40.

The square root of 211719919 is about 14550.5985787527. The cubic root of 211719919 is about 596.0104938996.

The spelling of 211719919 in words is "two hundred eleven million, seven hundred nineteen thousand, nine hundred nineteen".