21220100121104 has 40 divisors (see below), whose sum is σ = 41890389568920. Its totient is φ = 10409683801088.

The previous prime is 21220100121071. The next prime is 21220100121119. The reversal of 21220100121104 is 40112100102212.

It can be written as a sum of positive squares in 4 ways, for example, as 5339556319504 + 15880543801600 = 2310748^2 + 3985040^2 .

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, 59784284 + ... + 60138180.

It is an arithmetic number, because the mean of its divisors is an integer number (1047259739223).

Almost surely, 2^{21220100121104} is an apocalyptic number.

It is an amenable number.

21220100121104 is a deficient number, since it is larger than the sum of its proper divisors (20670289447816).

21220100121104 is a wasteful number, since it uses less digits than its factorization.

21220100121104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 424667 (or 424661 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21220100121104 its reverse (40112100102212), we get a palindrome (61332200223316).

The spelling of 21220100121104 in words is "twenty-one trillion, two hundred twenty billion, one hundred million, one hundred twenty-one thousand, one hundred four".