211213913 has 2 divisors, whose sum is σ = 211213914. Its totient is φ = 211213912.

The previous prime is 211213841. The next prime is 211213939. The reversal of 211213913 is 319312112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 150872089 + 60341824 = 12283^2 + 7768^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211213913 is a prime.

It is a super-2 number, since 2×211213913² = 89222634089543138, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (211213973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105606956 + 105606957.

It is an arithmetic number, because the mean of its divisors is an integer number (105606957).

Almost surely, 2^211213913 is an apocalyptic number.

It is an amenable number.

211213913 is a deficient number, since it is larger than the sum of its proper divisors (1).

211213913 is an equidigital number, since it uses as much as digits as its factorization.

211213913 is an evil number, because the sum of its binary digits is even.

The product of its digits is 324, while the sum is 23.

The square root of 211213913 is about 14533.2003701869. The cubic root of 211213913 is about 595.5352977578.

The spelling of 211213913 in words is "two hundred eleven million, two hundred thirteen thousand, nine hundred thirteen".