21223011011 has 8 divisors (see below), whose sum is σ = 21560345280. Its totient is φ = 20887394112.

The previous prime is 21223010999. The next prime is 21223011013. The reversal of 21223011011 is 11011032212.

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 21223011011 - 2⁶ = 21223010947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21223011013) 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, 404420 + ... + 453873.

It is an arithmetic number, because the mean of its divisors is an integer number (2695043160).

Almost surely, 2^21223011011 is an apocalyptic number.

21223011011 is a deficient number, since it is larger than the sum of its proper divisors (337334269).

21223011011 is an equidigital number, since it uses as much as digits as its factorization.

21223011011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 858685.

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 21223011011 its reverse (11011032212), we get a palindrome (32234043223).

The spelling of 21223011011 in words is "twenty-one billion, two hundred twenty-three million, eleven thousand, eleven".