21220231122 has 24 divisors (see below), whose sum is σ = 47680026576. Its totient is φ = 7073410212.

The previous prime is 21220231091. The next prime is 21220231139. The reversal of 21220231122 is 22113202212.

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 = 21220231095 and 21220231104.

It is an unprimeable number.

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, 21831028 + ... + 21831999.

It is an arithmetic number, because the mean of its divisors is an integer number (1986667774).

Almost surely, 2^21220231122 is an apocalyptic number.

21220231122 is an abundant number, since it is smaller than the sum of its proper divisors (26459795454).

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

21220231122 is an equidigital number, since it uses as much as digits as its factorization.

21220231122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43663044 (or 43663032 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 21220231122 its reverse (22113202212), we get a palindrome (43333433334).

The spelling of 21220231122 in words is "twenty-one billion, two hundred twenty million, two hundred thirty-one thousand, one hundred twenty-two".