21112232022 has 72 divisors (see below), whose sum is σ = 54343706976. Its totient is φ = 5903712864.

The previous prime is 21112231999. The next prime is 21112232023. The reversal of 21112232022 is 22023221112.

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 = 21112231986 and 21112232004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21112232023) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 213193 + ... + 296100.

It is an arithmetic number, because the mean of its divisors is an integer number (754773708).

Almost surely, 2^21112232022 is an apocalyptic number.

21112232022 is an abundant number, since it is smaller than the sum of its proper divisors (33231474954).

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

21112232022 is a wasteful number, since it uses less digits than its factorization.

21112232022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 509362 (or 509352 counting only the distinct ones).

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

Adding to 21112232022 its reverse (22023221112), we get a palindrome (43135453134).

The spelling of 21112232022 in words is "twenty-one billion, one hundred twelve million, two hundred thirty-two thousand, twenty-two".