21222202009 has 8 divisors (see below), whose sum is σ = 21422709000. Its totient is φ = 21021800832.

The previous prime is 21222201989. The next prime is 21222202021. The reversal of 21222202009 is 90020222212.

It can be written as a sum of positive squares in 4 ways, for example, as 3258697225 + 17963504784 = 57085^2 + 134028^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21222202009 - 2⁷ = 21222201881 is a prime.

It is a super-2 number, since 2×21222202009² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21222202049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 410397 + ... + 459205.

It is an arithmetic number, because the mean of its divisors is an integer number (2677838625).

Almost surely, 2^21222202009 is an apocalyptic number.

It is an amenable number.

21222202009 is a deficient number, since it is larger than the sum of its proper divisors (200506991).

21222202009 is a wasteful number, since it uses less digits than its factorization.

21222202009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52907.

The product of its (nonzero) digits is 576, while the sum is 22.

The spelling of 21222202009 in words is "twenty-one billion, two hundred twenty-two million, two hundred two thousand, nine".