21231232211 has 16 divisors (see below), whose sum is σ = 24741367488. Its totient is φ = 17840908800.

The previous prime is 21231232201. The next prime is 21231232213. The reversal of 21231232211 is 11223213212.

It is a cyclic number.

It is not a de Polignac number, because 21231232211 - 2²² = 21227037907 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21231232213) 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, 468431 + ... + 511751.

It is an arithmetic number, because the mean of its divisors is an integer number (1546335468).

Almost surely, 2^21231232211 is an apocalyptic number.

21231232211 is a deficient number, since it is larger than the sum of its proper divisors (3510135277).

21231232211 is a wasteful number, since it uses less digits than its factorization.

21231232211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44702.

The product of its digits is 288, while the sum is 20.

Adding to 21231232211 its reverse (11223213212), we get a palindrome (32454445423).

The spelling of 21231232211 in words is "twenty-one billion, two hundred thirty-one million, two hundred thirty-two thousand, two hundred eleven".