21221220211022 has 8 divisors (see below), whose sum is σ = 34280432648616. Its totient is φ = 9794409328152.

The previous prime is 21221220211007. The next prime is 21221220211151. The reversal of 21221220211022 is 22011202212212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 21221220210985 and 21221220211003.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 408100388648 + ... + 408100388699.

It is an arithmetic number, because the mean of its divisors is an integer number (4285054081077).

Almost surely, 2^{21221220211022} is an apocalyptic number.

21221220211022 is a deficient number, since it is larger than the sum of its proper divisors (13059212437594).

21221220211022 is a wasteful number, since it uses less digits than its factorization.

21221220211022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 816200777362.

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 21221220211022 its reverse (22011202212212), we get a palindrome (43232422423234).

The spelling of 21221220211022 in words is "twenty-one trillion, two hundred twenty-one billion, two hundred twenty million, two hundred eleven thousand, twenty-two".