21221100022 has 16 divisors (see below), whose sum is σ = 32596641792. Its totient is φ = 10355927400.

The previous prime is 21221100013. The next prime is 21221100031. The reversal of 21221100022 is 22000112212.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21221100013) and next prime (21221100031).

It is a super-2 number, since 2×21221100022² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21221099975 and 21221100011.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21147 + ... + 207097.

It is an arithmetic number, because the mean of its divisors is an integer number (2037290112).

Almost surely, 2^21221100022 is an apocalyptic number.

21221100022 is a deficient number, since it is larger than the sum of its proper divisors (11375541770).

21221100022 is a wasteful number, since it uses less digits than its factorization.

21221100022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 187323.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 21221100022 its reverse (22000112212), we get a palindrome (43221212234).

The spelling of 21221100022 in words is "twenty-one billion, two hundred twenty-one million, one hundred thousand, twenty-two".