21101222110021 has 8 divisors (see below), whose sum is σ = 22611656862144. Its totient is φ = 19620696957120.

The previous prime is 21101222110013. The next prime is 21101222110063. The reversal of 21101222110021 is 12001122210112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21101222110021 - 2³ = 21101222110013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21101222109977 and 21101222110004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21101222110321) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7477398345 + ... + 7477401166.

It is an arithmetic number, because the mean of its divisors is an integer number (2826457107768).

Almost surely, 2^{21101222110021} is an apocalyptic number.

It is an amenable number.

21101222110021 is a deficient number, since it is larger than the sum of its proper divisors (1510434752123).

21101222110021 is a wasteful number, since it uses less digits than its factorization.

21101222110021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14954799611.

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

Adding to 21101222110021 its reverse (12001122210112), we get a palindrome (33102344320133).

The spelling of 21101222110021 in words is "twenty-one trillion, one hundred one billion, two hundred twenty-two million, one hundred ten thousand, twenty-one".