21222202122 has 32 divisors (see below), whose sum is σ = 51447764160. Its totient is φ = 6430970160.

The previous prime is 21222202109. The next prime is 21222202151. The reversal of 21222202122 is 22120222212.

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 = 21222202095 and 21222202104.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17863213 + ... + 17864400.

It is an arithmetic number, because the mean of its divisors is an integer number (1607742630).

Almost surely, 2^21222202122 is an apocalyptic number.

21222202122 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21222202122 is an abundant number, since it is smaller than the sum of its proper divisors (30225562038).

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

21222202122 is a wasteful number, since it uses less digits than its factorization.

21222202122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35727635 (or 35727629 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

Adding to 21222202122 its reverse (22120222212), we get a palindrome (43342424334).

The spelling of 21222202122 in words is "twenty-one billion, two hundred twenty-two million, two hundred two thousand, one hundred twenty-two".