21323122011 has 12 divisors (see below), whose sum is σ = 30823719888. Its totient is φ = 14204497104.

The previous prime is 21323121979. The next prime is 21323122013. The reversal of 21323122011 is 11022132312.

21323122011 is a `hidden beast` number, since 213 + 231 + 220 + 1 + 1 = 666.

It is not a de Polignac number, because 21323122011 - 2⁵ = 21323121979 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21323122013) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 897420 + ... + 920873.

It is an arithmetic number, because the mean of its divisors is an integer number (2568643324).

Almost surely, 2^21323122011 is an apocalyptic number.

21323122011 is a deficient number, since it is larger than the sum of its proper divisors (9500597877).

21323122011 is a wasteful number, since it uses less digits than its factorization.

21323122011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1819602 (or 1819599 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 21323122011 its reverse (11022132312), we get a palindrome (32345254323).

The spelling of 21323122011 in words is "twenty-one billion, three hundred twenty-three million, one hundred twenty-two thousand, eleven".