21100201221121 has 8 divisors (see below), whose sum is σ = 23018669676288. Its totient is φ = 19181777490000.

The previous prime is 21100201221107. The next prime is 21100201221157. The reversal of 21100201221121 is 12112210200112.

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 21100201221121 - 2¹⁷ = 21100201090049 is a prime.

It is a super-2 number, since 2×21100201221121² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21100201221095 and 21100201221104.

It is not an unprimeable number, because it can be changed into a prime (21100201221161) 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, 10190730 + ... + 12085171.

It is an arithmetic number, because the mean of its divisors is an integer number (2877333709536).

Almost surely, 2^{21100201221121} is an apocalyptic number.

It is an amenable number.

21100201221121 is a deficient number, since it is larger than the sum of its proper divisors (1918468455167).

21100201221121 is a wasteful number, since it uses less digits than its factorization.

21100201221121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22362023.

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

Adding to 21100201221121 its reverse (12112210200112), we get a palindrome (33212411421233).

The spelling of 21100201221121 in words is "twenty-one trillion, one hundred billion, two hundred one million, two hundred twenty-one thousand, one hundred twenty-one".