21101102220121 has 16 divisors (see below), whose sum is σ = 26313334167168. Its totient is φ = 16439000774400.

The previous prime is 21101102220113. The next prime is 21101102220151. The reversal of 21101102220121 is 12102220110112.

It is a cyclic number.

It is not a de Polignac number, because 21101102220121 - 2³ = 21101102220113 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21101102220095 and 21101102220104.

It is not an unprimeable number, because it can be changed into a prime (21101102220151) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28098160 + ... + 28839361.

It is an arithmetic number, because the mean of its divisors is an integer number (1644583385448).

Almost surely, 2^{21101102220121} is an apocalyptic number.

It is an amenable number.

21101102220121 is a deficient number, since it is larger than the sum of its proper divisors (5212231947047).

21101102220121 is a wasteful number, since it uses less digits than its factorization.

21101102220121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56942352.

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

Adding to 21101102220121 its reverse (12102220110112), we get a palindrome (33203322330233).

The spelling of 21101102220121 in words is "twenty-one trillion, one hundred one billion, one hundred two million, two hundred twenty thousand, one hundred twenty-one".