1921109219 has 2 divisors, whose sum is σ = 1921109220. Its totient is φ = 1921109218.

The previous prime is 1921109189. The next prime is 1921109231. The reversal of 1921109219 is 9129011291.

It is a strong prime.

It is an emirp because it is prime and its reverse (9129011291) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1921109219 is a prime.

It is a super-2 number, since 2×1921109219² = 7381321262653579922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1921109249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 960554609 + 960554610.

It is an arithmetic number, because the mean of its divisors is an integer number (960554610).

Almost surely, 2^1921109219 is an apocalyptic number.

1921109219 is a deficient number, since it is larger than the sum of its proper divisors (1).

1921109219 is an equidigital number, since it uses as much as digits as its factorization.

1921109219 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2916, while the sum is 35.

The square root of 1921109219 is about 43830.4599451112. The cubic root of 1921109219 is about 1243.1323036194.

The spelling of 1921109219 in words is "one billion, nine hundred twenty-one million, one hundred nine thousand, two hundred nineteen".