21101000122209 has 16 divisors (see below), whose sum is σ = 32154943932288. Its totient is φ = 12057324736512.

The previous prime is 21101000122199. The next prime is 21101000122211. The reversal of 21101000122209 is 90222100010112.

It is not a de Polignac number, because 21101000122209 - 2²⁹ = 21100463251297 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (21101000122249) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15568122 + ... + 16869155.

It is an arithmetic number, because the mean of its divisors is an integer number (2009683995768).

Almost surely, 2^{21101000122209} is an apocalyptic number.

It is an amenable number.

21101000122209 is a deficient number, since it is larger than the sum of its proper divisors (11053943810079).

21101000122209 is a wasteful number, since it uses less digits than its factorization.

21101000122209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32468264.

The product of its (nonzero) digits is 144, while the sum is 21.

The spelling of 21101000122209 in words is "twenty-one trillion, one hundred one billion, one hundred twenty-two thousand, two hundred nine".