21201202001121 has 16 divisors (see below), whose sum is σ = 28693476710400. Its totient is φ = 13921579405008.

The previous prime is 21201202001099. The next prime is 21201202001137. The reversal of 21201202001121 is 12110020210212.

It is not a de Polignac number, because 21201202001121 - 2¹¹ = 21201201999073 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21201202001121.

It is not an unprimeable number, because it can be changed into a prime (21201202001321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4296261 + ... + 7801298.

It is an arithmetic number, because the mean of its divisors is an integer number (1793342294400).

Almost surely, 2^{21201202001121} is an apocalyptic number.

It is an amenable number.

21201202001121 is a deficient number, since it is larger than the sum of its proper divisors (7492274709279).

21201202001121 is a wasteful number, since it uses less digits than its factorization.

21201202001121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12106348.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21201202001121 its reverse (12110020210212), we get a palindrome (33311222211333).

The spelling of 21201202001121 in words is "twenty-one trillion, two hundred one billion, two hundred two million, one thousand, one hundred twenty-one".