21000021203323 has 2 divisors, whose sum is σ = 21000021203324. Its totient is φ = 21000021203322.

The previous prime is 21000021203311. The next prime is 21000021203377. The reversal of 21000021203323 is 32330212000012.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21000021203323 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21000021203323.

It is not a weakly prime, because it can be changed into another prime (21000021203123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10500010601661 + 10500010601662.

It is an arithmetic number, because the mean of its divisors is an integer number (10500010601662).

Almost surely, 2^{21000021203323} is an apocalyptic number.

21000021203323 is a deficient number, since it is larger than the sum of its proper divisors (1).

21000021203323 is an equidigital number, since it uses as much as digits as its factorization.

21000021203323 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 19.

Adding to 21000021203323 its reverse (32330212000012), we get a palindrome (53330233203335).

The spelling of 21000021203323 in words is "twenty-one trillion, twenty-one million, two hundred three thousand, three hundred twenty-three".