1219422221 has 2 divisors, whose sum is σ = 1219422222. Its totient is φ = 1219422220.

The previous prime is 1219422181. The next prime is 1219422227. The reversal of 1219422221 is 1222249121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 975625225 + 243796996 = 31235^2 + 15614^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1219422221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1219422227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 609711110 + 609711111.

It is an arithmetic number, because the mean of its divisors is an integer number (609711111).

Almost surely, 2^1219422221 is an apocalyptic number.

It is an amenable number.

1219422221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1219422221 is an equidigital number, since it uses as much as digits as its factorization.

1219422221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1152, while the sum is 26.

The square root of 1219422221 is about 34920.2265313385. The cubic root of 1219422221 is about 1068.3610220819.

The spelling of 1219422221 in words is "one billion, two hundred nineteen million, four hundred twenty-two thousand, two hundred twenty-one".