21000021021323 has 2 divisors, whose sum is σ = 21000021021324. Its totient is φ = 21000021021322.

The previous prime is 21000021021299. The next prime is 21000021021341. The reversal of 21000021021323 is 32312012000012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21000021021323 - 2¹⁴ = 21000021004939 is a prime.

It is not a weakly prime, because it can be changed into another prime (21000021021223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10500010510661 + 10500010510662.

It is an arithmetic number, because the mean of its divisors is an integer number (10500010510662).

Almost surely, 2^{21000021021323} is an apocalyptic number.

21000021021323 is a deficient number, since it is larger than the sum of its proper divisors (1).

21000021021323 is an equidigital number, since it uses as much as digits as its factorization.

21000021021323 is an odious number, because the sum of its binary digits is odd.

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

Adding to 21000021021323 its reverse (32312012000012), we get a palindrome (53312033021335).

The spelling of 21000021021323 in words is "twenty-one trillion, twenty-one million, twenty-one thousand, three hundred twenty-three".