21222011001999 has 16 divisors (see below), whose sum is σ = 28986301128960. Its totient is φ = 13802867432640.

The previous prime is 21222011001943. The next prime is 21222011002021. The reversal of 21222011001999 is 99910011022212.

It is a happy number.

It is not a de Polignac number, because 21222011001999 - 2⁸ = 21222011001743 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21222011009999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 48247864 + ... + 48685730.

It is an arithmetic number, because the mean of its divisors is an integer number (1811643820560).

Almost surely, 2^{21222011001999} is an apocalyptic number.

21222011001999 is a deficient number, since it is larger than the sum of its proper divisors (7764290126961).

21222011001999 is a wasteful number, since it uses less digits than its factorization.

21222011001999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 831950.

The product of its (nonzero) digits is 11664, while the sum is 39.

The spelling of 21222011001999 in words is "twenty-one trillion, two hundred twenty-two billion, eleven million, one thousand, nine hundred ninety-nine".