21221100111022 has 32 divisors (see below), whose sum is σ = 36632145816000. Its totient is φ = 9031507803648.

The previous prime is 21221100111019. The next prime is 21221100111077. The reversal of 21221100111022 is 22011100112212.

It is a junction number, because it is equal to n+sod(n) for n = 21221100110987 and 21221100111005.

It is a congruent number.

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, 7295254 + ... + 9780742.

It is an arithmetic number, because the mean of its divisors is an integer number (1144754556750).

Almost surely, 2^{21221100111022} is an apocalyptic number.

21221100111022 is a deficient number, since it is larger than the sum of its proper divisors (15411045704978).

21221100111022 is a wasteful number, since it uses less digits than its factorization.

21221100111022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2489740.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21221100111022 its reverse (22011100112212), we get a palindrome (43232200223234).

The spelling of 21221100111022 in words is "twenty-one trillion, two hundred twenty-one billion, one hundred million, one hundred eleven thousand, twenty-two".