21000201023321 has 16 divisors (see below), whose sum is σ = 22686436523520. Its totient is φ = 19324117655040.

The previous prime is 21000201023297. The next prime is 21000201023377. The reversal of 21000201023321 is 12332010200012.

It is a cyclic number.

It is not a de Polignac number, because 21000201023321 - 2⁶ = 21000201023257 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 21000201023321.

It is not an unprimeable number, because it can be changed into a prime (21000201023521) 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, 14733266 + ... + 16095636.

It is an arithmetic number, because the mean of its divisors is an integer number (1417902282720).

Almost surely, 2^{21000201023321} is an apocalyptic number.

It is an amenable number.

21000201023321 is a deficient number, since it is larger than the sum of its proper divisors (1686235500199).

21000201023321 is a wasteful number, since it uses less digits than its factorization.

21000201023321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1366096.

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

Adding to 21000201023321 its reverse (12332010200012), we get a palindrome (33332211223333).

The spelling of 21000201023321 in words is "twenty-one trillion, two hundred one million, twenty-three thousand, three hundred twenty-one".