21202002000121 has 16 divisors (see below), whose sum is σ = 22101163061760. Its totient is φ = 20316478026240.

The previous prime is 21202002000107. The next prime is 21202002000197. The reversal of 21202002000121 is 12100020020212.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21202002000121 - 2⁷ = 21202001999993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21202012000121) 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 15 ways as a sum of consecutive naturals, for example, 5318185 + ... + 8407561.

It is an arithmetic number, because the mean of its divisors is an integer number (1381322691360).

Almost surely, 2^{21202002000121} is an apocalyptic number.

It is an amenable number.

21202002000121 is a deficient number, since it is larger than the sum of its proper divisors (899161061639).

21202002000121 is a wasteful number, since it uses less digits than its factorization.

21202002000121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3091584.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 21202002000121 its reverse (12100020020212), we get a palindrome (33302022020333).

The spelling of 21202002000121 in words is "twenty-one trillion, two hundred two billion, two million, one hundred twenty-one", and thus it is an aban number.