21221021111122 has 32 divisors (see below), whose sum is σ = 36590814703872. Its totient is φ = 9041747701824.

The previous prime is 21221021111117. The next prime is 21221021111161. The reversal of 21221021111122 is 22111112012212.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 21221021111122.

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, 57379348 + ... + 57748000.

It is an arithmetic number, because the mean of its divisors is an integer number (1143462959496).

Almost surely, 2^{21221021111122} is an apocalyptic number.

21221021111122 is a deficient number, since it is larger than the sum of its proper divisors (15369793592750).

21221021111122 is a wasteful number, since it uses less digits than its factorization.

21221021111122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 392602.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 21221021111122 its reverse (22111112012212), we get a palindrome (43332133123334).

The spelling of 21221021111122 in words is "twenty-one trillion, two hundred twenty-one billion, twenty-one million, one hundred eleven thousand, one hundred twenty-two".