21001202222209 has 12 divisors (see below), whose sum is σ = 23143307945940. Its totient is φ = 19042922280800.

The previous prime is 21001202222207. The next prime is 21001202222219. The reversal of 21001202222209 is 90222220210012.

It can be written as a sum of positive squares in 2 ways, for example, as 1924748346609 + 19076453875600 = 1387353^2 + 4367660^2 .

It is not a de Polignac number, because 21001202222209 - 2¹ = 21001202222207 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21001202222201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 223042462 + ... + 223136599.

It is an arithmetic number, because the mean of its divisors is an integer number (1928608995495).

Almost surely, 2^{21001202222209} is an apocalyptic number.

It is an amenable number.

21001202222209 is a deficient number, since it is larger than the sum of its proper divisors (2142105723731).

21001202222209 is a wasteful number, since it uses less digits than its factorization.

21001202222209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 446179472 (or 446179461 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 25.

The spelling of 21001202222209 in words is "twenty-one trillion, one billion, two hundred two million, two hundred twenty-two thousand, two hundred nine".