21123311022 has 24 divisors (see below), whose sum is σ = 49927826520. Its totient is φ = 6401003280.

The previous prime is 21123311017. The next prime is 21123311023. The reversal of 21123311022 is 22011332112.

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 = 21123310986 and 21123311004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21123311023) 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 11 ways as a sum of consecutive naturals, for example, 53341497 + ... + 53341892.

It is an arithmetic number, because the mean of its divisors is an integer number (2080326105).

Almost surely, 2^21123311022 is an apocalyptic number.

21123311022 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21123311022 is an abundant number, since it is smaller than the sum of its proper divisors (28804515498).

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

21123311022 is a wasteful number, since it uses less digits than its factorization.

21123311022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106683408 (or 106683405 counting only the distinct ones).

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

Adding to 21123311022 its reverse (22011332112), we get a palindrome (43134643134).

The spelling of 21123311022 in words is "twenty-one billion, one hundred twenty-three million, three hundred eleven thousand, twenty-two".