21011306022 has 96 divisors (see below), whose sum is σ = 52867137024. Its totient is φ = 5907168000.

The previous prime is 21011305999. The next prime is 21011306027. The reversal of 21011306022 is 22060311012.

21011306022 is a `hidden beast` number, since 21 + 0 + 11 + 30 + 602 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 21011305986 and 21011306004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21011306027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2030622 + ... + 2040942.

It is an arithmetic number, because the mean of its divisors is an integer number (550699344).

Almost surely, 2^21011306022 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21011306022, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26433568512).

21011306022 is an abundant number, since it is smaller than the sum of its proper divisors (31855831002).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21011306022 is a wasteful number, since it uses less digits than its factorization.

21011306022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10594 (or 10591 counting only the distinct ones).

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

Adding to 21011306022 its reverse (22060311012), we get a palindrome (43071617034).

The spelling of 21011306022 in words is "twenty-one billion, eleven million, three hundred six thousand, twenty-two".