21202000121 has 8 divisors (see below), whose sum is σ = 21533603520. Its totient is φ = 20870842608.

The previous prime is 21202000103. The next prime is 21202000123. The reversal of 21202000121 is 12100020212.

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 21202000121 - 2¹⁰ = 21201999097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21202000123) 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, 14981 + ... + 206466.

It is an arithmetic number, because the mean of its divisors is an integer number (2691700440).

Almost surely, 2^21202000121 is an apocalyptic number.

It is an amenable number.

21202000121 is a deficient number, since it is larger than the sum of its proper divisors (331603399).

21202000121 is a wasteful number, since it uses less digits than its factorization.

21202000121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222943.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 21202000121 its reverse (12100020212), we get a palindrome (33302020333).

The spelling of 21202000121 in words is "twenty-one billion, two hundred two million, one hundred twenty-one", and thus it is an aban number.