1022221999 has 2 divisors, whose sum is σ = 1022222000. Its totient is φ = 1022221998.

The previous prime is 1022221997. The next prime is 1022222017. The reversal of 1022221999 is 9991222201.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1022221999 - 2¹ = 1022221997 is a prime.

Together with 1022221997, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1022221997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 511110999 + 511111000.

It is an arithmetic number, because the mean of its divisors is an integer number (511111000).

Almost surely, 2^1022221999 is an apocalyptic number.

1022221999 is a deficient number, since it is larger than the sum of its proper divisors (1).

1022221999 is an equidigital number, since it uses as much as digits as its factorization.

1022221999 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11664, while the sum is 37.

The square root of 1022221999 is about 31972.2066645391. The cubic root of 1022221999 is about 1007.3531319265.

The spelling of 1022221999 in words is "one billion, twenty-two million, two hundred twenty-one thousand, nine hundred ninety-nine".