211219999987 has 2 divisors, whose sum is σ = 211219999988. Its totient is φ = 211219999986.

The previous prime is 211219999951. The next prime is 211219999993. The reversal of 211219999987 is 789999912112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 211219999987 - 2¹⁹ = 211219475699 is a prime.

It is a super-2 number, since 2×211219999987² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (211219999087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105609999993 + 105609999994.

It is an arithmetic number, because the mean of its divisors is an integer number (105609999994).

Almost surely, 2^211219999987 is an apocalyptic number.

211219999987 is a deficient number, since it is larger than the sum of its proper divisors (1).

211219999987 is an equidigital number, since it uses as much as digits as its factorization.

211219999987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13226976, while the sum is 67.

The spelling of 211219999987 in words is "two hundred eleven billion, two hundred nineteen million, nine hundred ninety-nine thousand, nine hundred eighty-seven".