211219121 has 2 divisors, whose sum is σ = 211219122. Its totient is φ = 211219120.

The previous prime is 211219103. The next prime is 211219123. The reversal of 211219121 is 121912112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 184552225 + 26666896 = 13585^2 + 5164^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211219121 is a prime.

It is a super-2 number, since 2×211219121² = 89227034152025282, which contains 22 as substring.

Together with 211219123, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 211219093 and 211219102.

It is not a weakly prime, because it can be changed into another prime (211219123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105609560 + 105609561.

It is an arithmetic number, because the mean of its divisors is an integer number (105609561).

Almost surely, 2^211219121 is an apocalyptic number.

It is an amenable number.

211219121 is a deficient number, since it is larger than the sum of its proper divisors (1).

211219121 is an equidigital number, since it uses as much as digits as its factorization.

211219121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 72, while the sum is 20.

The square root of 211219121 is about 14533.3795450336. The cubic root of 211219121 is about 595.5401925148.

The spelling of 211219121 in words is "two hundred eleven million, two hundred nineteen thousand, one hundred twenty-one".