21002130112121 has 8 divisors (see below), whose sum is σ = 22108111912320. Its totient is φ = 19896208965072.

The previous prime is 21002130112111. The next prime is 21002130112193. The reversal of 21002130112121 is 12121103120012.

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 not a de Polignac number, because 21002130112121 - 2⁶ = 21002130112057 is a prime.

It is a super-2 number, since 2×21002130112121² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21002130112121.

It is not an unprimeable number, because it can be changed into a prime (21002130112111) 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, 14451665 + ... + 15838398.

It is an arithmetic number, because the mean of its divisors is an integer number (2763513989040).

Almost surely, 2^{21002130112121} is an apocalyptic number.

It is an amenable number.

21002130112121 is a deficient number, since it is larger than the sum of its proper divisors (1105981800199).

21002130112121 is a wasteful number, since it uses less digits than its factorization.

21002130112121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30326575.

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 21002130112121 its reverse (12121103120012), we get a palindrome (33123233232133).

The spelling of 21002130112121 in words is "twenty-one trillion, two billion, one hundred thirty million, one hundred twelve thousand, one hundred twenty-one".