21210022020209 has 24 divisors (see below), whose sum is σ = 23836708361664. Its totient is φ = 18716056150400.

The previous prime is 21210022020163. The next prime is 21210022020233. The reversal of 21210022020209 is 90202022001212.

It is a de Polignac number, because none of the positive numbers 2^k-21210022020209 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21210022020259) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 731444 + ... + 6554010.

It is an arithmetic number, because the mean of its divisors is an integer number (993196181736).

Almost surely, 2^{21210022020209} is an apocalyptic number.

It is an amenable number.

21210022020209 is a deficient number, since it is larger than the sum of its proper divisors (2626686341455).

21210022020209 is a wasteful number, since it uses less digits than its factorization.

21210022020209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5822857 (or 5822816 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 23.

The spelling of 21210022020209 in words is "twenty-one trillion, two hundred ten billion, twenty-two million, twenty thousand, two hundred nine".