21203200232221 has 16 divisors (see below), whose sum is σ = 25509695385600. Its totient is φ = 17216228172528.

The previous prime is 21203200232111. The next prime is 21203200232231. The reversal of 21203200232221 is 12223200230212.

It is not a de Polignac number, because 21203200232221 - 2³⁹ = 20653444418333 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21203200232192 and 21203200232201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21203200232231) 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, 4885105 + ... + 8140678.

It is an arithmetic number, because the mean of its divisors is an integer number (1594355961600).

Almost surely, 2^{21203200232221} is an apocalyptic number.

It is an amenable number.

21203200232221 is a deficient number, since it is larger than the sum of its proper divisors (4306495153379).

21203200232221 is a wasteful number, since it uses less digits than its factorization.

21203200232221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13038048.

The product of its (nonzero) digits is 1152, while the sum is 22.

Adding to 21203200232221 its reverse (12223200230212), we get a palindrome (33426400462433).

The spelling of 21203200232221 in words is "twenty-one trillion, two hundred three billion, two hundred million, two hundred thirty-two thousand, two hundred twenty-one".