22001999 has 2 divisors, whose sum is σ = 22002000. Its totient is φ = 22001998.

The previous prime is 22001989. The next prime is 22002011. The reversal of 22001999 is 99910022.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 22001999 - 2⁸ = 22001743 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22001989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11000999 + 11001000.

It is an arithmetic number, because the mean of its divisors is an integer number (11001000).

Almost surely, 2^22001999 is an apocalyptic number.

22001999 is a deficient number, since it is larger than the sum of its proper divisors (1).

22001999 is an equidigital number, since it uses as much as digits as its factorization.

22001999 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2916, while the sum is 32.

The square root of 22001999 is about 4690.6288490990. The cubic root of 22001999 is about 280.2124195913.

The spelling of 22001999 in words is "twenty-two million, one thousand, nine hundred ninety-nine".