21211221022 has 24 divisors (see below), whose sum is σ = 32305335480. Its totient is φ = 10444356000.

The previous prime is 21211221019. The next prime is 21211221061. The reversal of 21211221022 is 22012211212.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21211220987 and 21211221005.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6522897 + ... + 6526147.

It is an arithmetic number, because the mean of its divisors is an integer number (1346055645).

Almost surely, 2^21211221022 is an apocalyptic number.

21211221022 is a deficient number, since it is larger than the sum of its proper divisors (11094114458).

21211221022 is a wasteful number, since it uses less digits than its factorization.

21211221022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3708 (or 3535 counting only the distinct ones).

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

Adding to 21211221022 its reverse (22012211212), we get a palindrome (43223432234).

The spelling of 21211221022 in words is "twenty-one billion, two hundred eleven million, two hundred twenty-one thousand, twenty-two".