21002012200121 has 8 divisors (see below), whose sum is σ = 21028794379488. Its totient is φ = 20975232204000.

The previous prime is 21002012200111. The next prime is 21002012200139. The reversal of 21002012200121 is 12100221020012.

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 21002012200121 - 2²² = 21002008005817 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21002012200096 and 21002012200105.

It is not an unprimeable number, because it can be changed into a prime (21002012200111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19158626 + ... + 20225156.

It is an arithmetic number, because the mean of its divisors is an integer number (2628599297436).

Almost surely, 2^{21002012200121} is an apocalyptic number.

It is an amenable number.

21002012200121 is a deficient number, since it is larger than the sum of its proper divisors (26782179367).

21002012200121 is a wasteful number, since it uses less digits than its factorization.

21002012200121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1091623.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21002012200121 its reverse (12100221020012), we get a palindrome (33102233220133).

The spelling of 21002012200121 in words is "twenty-one trillion, two billion, twelve million, two hundred thousand, one hundred twenty-one".