21001120110121 has 8 divisors (see below), whose sum is σ = 22106517864320. Its totient is φ = 19895729920272.

The previous prime is 21001120110073. The next prime is 21001120110127. The reversal of 21001120110121 is 12101102110012.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21001120110121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21001120110127) 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, 4332991 + ... + 7795963.

It is an arithmetic number, because the mean of its divisors is an integer number (2763314733040).

Almost surely, 2^{21001120110121} is an apocalyptic number.

It is an amenable number.

21001120110121 is a deficient number, since it is larger than the sum of its proper divisors (1105397754199).

21001120110121 is a wasteful number, since it uses less digits than its factorization.

21001120110121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3782175.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 21001120110121 its reverse (12101102110012), we get a palindrome (33102222220133).

The spelling of 21001120110121 in words is "twenty-one trillion, one billion, one hundred twenty million, one hundred ten thousand, one hundred twenty-one".