21122221022 has 16 divisors (see below), whose sum is σ = 36213324000. Its totient is φ = 9051429888.

The previous prime is 21122221019. The next prime is 21122221033. The reversal of 21122221022 is 22012222112.

It is a happy number.

It is a super-2 number, since 2×21122221022² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68354 + ... + 216602.

It is an arithmetic number, because the mean of its divisors is an integer number (2263332750).

Almost surely, 2^21122221022 is an apocalyptic number.

21122221022 is a deficient number, since it is larger than the sum of its proper divisors (15091102978).

21122221022 is a wasteful number, since it uses less digits than its factorization.

21122221022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158435.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 21122221022 its reverse (22012222112), we get a palindrome (43134443134).

The spelling of 21122221022 in words is "twenty-one billion, one hundred twenty-two million, two hundred twenty-one thousand, twenty-two".