21112221022 has 16 divisors (see below), whose sum is σ = 31788288000. Its totient is φ = 10516200760.

The previous prime is 21112220993. The next prime is 21112221023. The reversal of 21112221022 is 22012221112.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21112220987 and 21112221005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21112221023) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 555447 + ... + 592237.

It is an arithmetic number, because the mean of its divisors is an integer number (1986768000).

Almost surely, 2^21112221022 is an apocalyptic number.

21112221022 is a deficient number, since it is larger than the sum of its proper divisors (10676066978).

21112221022 is a wasteful number, since it uses less digits than its factorization.

21112221022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37871.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21112221022 its reverse (22012221112), we get a palindrome (43124442134).

The spelling of 21112221022 in words is "twenty-one billion, one hundred twelve million, two hundred twenty-one thousand, twenty-two".