21023220211 has 8 divisors (see below), whose sum is σ = 24037125984. Its totient is φ = 18011961600.

The previous prime is 21023220191. The next prime is 21023220259. The reversal of 21023220211 is 11202232012.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 21023220211 - 2²³ = 21014831603 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21023223211) 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, 644740 + ... + 676561.

It is an arithmetic number, because the mean of its divisors is an integer number (3004640748).

Almost surely, 2^21023220211 is an apocalyptic number.

21023220211 is a deficient number, since it is larger than the sum of its proper divisors (3013905773).

21023220211 is a wasteful number, since it uses less digits than its factorization.

21023220211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1323581.

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 21023220211 its reverse (11202232012), we get a palindrome (32225452223).

The spelling of 21023220211 in words is "twenty-one billion, twenty-three million, two hundred twenty thousand, two hundred eleven".