21232023211 has 16 divisors (see below), whose sum is σ = 24395445504. Its totient is φ = 18101408544.

The previous prime is 21232023167. The next prime is 21232023221. The reversal of 21232023211 is 11232023212.

It is a cyclic number.

It is not a de Polignac number, because 21232023211 - 2¹³ = 21232015019 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21232023221) 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, 1105785 + ... + 1124821.

It is an arithmetic number, because the mean of its divisors is an integer number (1524715344).

Almost surely, 2^21232023211 is an apocalyptic number.

21232023211 is a deficient number, since it is larger than the sum of its proper divisors (3163422293).

21232023211 is a wasteful number, since it uses less digits than its factorization.

21232023211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19890.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 21232023211 its reverse (11232023212), we get a palindrome (32464046423).

Subtracting from 21232023211 its reverse (11232023212), we obtain a palindrome (9999999999).

The spelling of 21232023211 in words is "twenty-one billion, two hundred thirty-two million, twenty-three thousand, two hundred eleven".