21032203121 has 16 divisors (see below), whose sum is σ = 22767480000. Its totient is φ = 19367352576.

The previous prime is 21032203103. The next prime is 21032203163. The reversal of 21032203121 is 12130223012.

It is a cyclic number.

It is not a de Polignac number, because 21032203121 - 2¹⁴ = 21032186737 is a prime.

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 21032203121.

It is not an unprimeable number, because it can be changed into a prime (21032203321) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5636 + ... + 205173.

It is an arithmetic number, because the mean of its divisors is an integer number (1422967500).

Almost surely, 2^21032203121 is an apocalyptic number.

It is an amenable number.

21032203121 is a deficient number, since it is larger than the sum of its proper divisors (1735276879).

21032203121 is a wasteful number, since it uses less digits than its factorization.

21032203121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210976.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 21032203121 its reverse (12130223012), we get a palindrome (33162426133).

The spelling of 21032203121 in words is "twenty-one billion, thirty-two million, two hundred three thousand, one hundred twenty-one".