21220200101209 has 8 divisors (see below), whose sum is σ = 22700080643688. Its totient is φ = 19766056611840.

The previous prime is 21220200101203. The next prime is 21220200101213. The reversal of 21220200101209 is 90210100202212.

It can be written as a sum of positive squares in 4 ways, for example, as 2921268925584 + 18298931175625 = 1709172^2 + 4277725^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21220200101209 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21220200101209.

It is not an unprimeable number, because it can be changed into a prime (21220200101203) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6434261572 + ... + 6434264869.

It is an arithmetic number, because the mean of its divisors is an integer number (2837510080461).

Almost surely, 2^{21220200101209} is an apocalyptic number.

It is an amenable number.

21220200101209 is a deficient number, since it is larger than the sum of its proper divisors (1479880542479).

21220200101209 is a wasteful number, since it uses less digits than its factorization.

21220200101209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12868526555.

The product of its (nonzero) digits is 288, while the sum is 22.

The spelling of 21220200101209 in words is "twenty-one trillion, two hundred twenty billion, two hundred million, one hundred one thousand, two hundred nine".