222121919 has 2 divisors, whose sum is σ = 222121920. Its totient is φ = 222121918.

The previous prime is 222121909. The next prime is 222121957. The reversal of 222121919 is 919121222.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 222121919 - 2⁴ = 222121903 is a prime.

It is a super-2 number, since 2×222121919² = 98676293800485122, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 222121891 and 222121900.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (222121909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111060959 + 111060960.

It is an arithmetic number, because the mean of its divisors is an integer number (111060960).

Almost surely, 2^222121919 is an apocalyptic number.

222121919 is a deficient number, since it is larger than the sum of its proper divisors (1).

222121919 is an equidigital number, since it uses as much as digits as its factorization.

222121919 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1296, while the sum is 29.

The square root of 222121919 is about 14903.7551979359. The cubic root of 222121919 is about 605.6157190374.

The spelling of 222121919 in words is "two hundred twenty-two million, one hundred twenty-one thousand, nine hundred nineteen".