21201010021121 has 8 divisors (see below), whose sum is σ = 24230197425984. Its totient is φ = 18171940538160.

The previous prime is 21201010021013. The next prime is 21201010021151. The reversal of 21201010021121 is 12112001010212.

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-21201010021121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21201010021096 and 21201010021105.

It is not an unprimeable number, because it can be changed into a prime (21201010021151) 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, 29094875 + ... + 29814656.

It is an arithmetic number, because the mean of its divisors is an integer number (3028774678248).

Almost surely, 2^{21201010021121} is an apocalyptic number.

It is an amenable number.

21201010021121 is a deficient number, since it is larger than the sum of its proper divisors (3029187404863).

21201010021121 is an equidigital number, since it uses as much as digits as its factorization.

21201010021121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58960951.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21201010021121 its reverse (12112001010212), we get a palindrome (33313011031333).

The spelling of 21201010021121 in words is "twenty-one trillion, two hundred one billion, ten million, twenty-one thousand, one hundred twenty-one".