21221211022 has 16 divisors (see below), whose sum is σ = 34732760832. Its totient is φ = 9644020920.

The previous prime is 21221211019. The next prime is 21221211043. The reversal of 21221211022 is 22011212212.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21221210987 and 21221211005.

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, 13003 + ... + 206425.

It is an arithmetic number, because the mean of its divisors is an integer number (2170797552).

Almost surely, 2^21221211022 is an apocalyptic number.

21221211022 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21221211022 is a deficient number, since it is larger than the sum of its proper divisors (13511549810).

21221211022 is a wasteful number, since it uses less digits than its factorization.

21221211022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198423.

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

Adding to 21221211022 its reverse (22011212212), we get a palindrome (43232423234).

The spelling of 21221211022 in words is "twenty-one billion, two hundred twenty-one million, two hundred eleven thousand, twenty-two".