21101102012221 has 8 divisors (see below), whose sum is σ = 26307867443904. Its totient is φ = 16442417152320.

The previous prime is 21101102012213. The next prime is 21101102012233. The reversal of 21101102012221 is 12221020110112.

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 21101102012221 - 2³ = 21101102012213 is a prime.

It is a super-2 number, since 2×21101102012221² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21101102012195 and 21101102012204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21101102012621) 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, 137020142860 + ... + 137020143013.

It is an arithmetic number, because the mean of its divisors is an integer number (3288483430488).

Almost surely, 2^{21101102012221} is an apocalyptic number.

It is an amenable number.

21101102012221 is a deficient number, since it is larger than the sum of its proper divisors (5206765431683).

21101102012221 is a wasteful number, since it uses less digits than its factorization.

21101102012221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 274040285891.

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

Adding to 21101102012221 its reverse (12221020110112), we get a palindrome (33322122122333).

The spelling of 21101102012221 in words is "twenty-one trillion, one hundred one billion, one hundred two million, twelve thousand, two hundred twenty-one".