21024211211 has 4 divisors (see below), whose sum is σ = 21102368400. Its totient is φ = 20946054024.

The previous prime is 21024211181. The next prime is 21024211213. The reversal of 21024211211 is 11211242012.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21024211211 - 2¹⁴ = 21024194827 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21024211211.

It is not an unprimeable number, because it can be changed into a prime (21024211213) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39078191 + ... + 39078728.

It is an arithmetic number, because the mean of its divisors is an integer number (5275592100).

Almost surely, 2^21024211211 is an apocalyptic number.

21024211211 is a deficient number, since it is larger than the sum of its proper divisors (78157189).

21024211211 is an equidigital number, since it uses as much as digits as its factorization.

21024211211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78157188.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21024211211 its reverse (11211242012), we get a palindrome (32235453223).

The spelling of 21024211211 in words is "twenty-one billion, twenty-four million, two hundred eleven thousand, two hundred eleven".