21101011200209 has 4 divisors (see below), whose sum is σ = 21230465256816. Its totient is φ = 20971557143604.

The previous prime is 21101011200193. The next prime is 21101011200223. The reversal of 21101011200209 is 90200211010112.

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 not a de Polignac number, because 21101011200209 - 2⁴ = 21101011200193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21101011200299) 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, 64727028059 + ... + 64727028384.

It is an arithmetic number, because the mean of its divisors is an integer number (5307616314204).

Almost surely, 2^{21101011200209} is an apocalyptic number.

It is an amenable number.

21101011200209 is a deficient number, since it is larger than the sum of its proper divisors (129454056607).

21101011200209 is a wasteful number, since it uses less digits than its factorization.

21101011200209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129454056606.

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

The spelling of 21101011200209 in words is "twenty-one trillion, one hundred one billion, eleven million, two hundred thousand, two hundred nine".