21210201110009 has 4 divisors (see below), whose sum is σ = 22326527484240. Its totient is φ = 20093874735780.

The previous prime is 21210201110003. The next prime is 21210201110023. The reversal of 21210201110009 is 90001110201212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21210201110009 is a prime.

It is a super-2 number, since 2×21210201110009² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21210201110003) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 558163187087 + ... + 558163187124.

It is an arithmetic number, because the mean of its divisors is an integer number (5581631871060).

Almost surely, 2^{21210201110009} is an apocalyptic number.

It is an amenable number.

21210201110009 is a deficient number, since it is larger than the sum of its proper divisors (1116326374231).

21210201110009 is a wasteful number, since it uses less digits than its factorization.

21210201110009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1116326374230.

The product of its (nonzero) digits is 72, while the sum is 20.

The spelling of 21210201110009 in words is "twenty-one trillion, two hundred ten billion, two hundred one million, one hundred ten thousand, nine".