21221221022110 has 16 divisors (see below), whose sum is σ = 39858989050656. Its totient is φ = 8119423695328.

The previous prime is 21221221022081. The next prime is 21221221022143. The reversal of 21221221022110 is 1122012212212.

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, 46133088949 + ... + 46133089408.

It is an arithmetic number, because the mean of its divisors is an integer number (2491186815666).

Almost surely, 2^{21221221022110} is an apocalyptic number.

21221221022110 is a deficient number, since it is larger than the sum of its proper divisors (18637768028546).

21221221022110 is a wasteful number, since it uses less digits than its factorization.

21221221022110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92266178387.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 21221221022110 its reverse (1122012212212), we get a palindrome (22343233234322).

The spelling of 21221221022110 in words is "twenty-one trillion, two hundred twenty-one billion, two hundred twenty-one million, twenty-two thousand, one hundred ten".