21000401012323 has 2 divisors, whose sum is σ = 21000401012324. Its totient is φ = 21000401012322.

The previous prime is 21000401012273. The next prime is 21000401012347. The reversal of 21000401012323 is 32321010400012.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21000401012323 - 2¹³ = 21000401004131 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21000401012323.

It is not a weakly prime, because it can be changed into another prime (21000401012623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10500200506161 + 10500200506162.

It is an arithmetic number, because the mean of its divisors is an integer number (10500200506162).

Almost surely, 2^{21000401012323} is an apocalyptic number.

21000401012323 is a deficient number, since it is larger than the sum of its proper divisors (1).

21000401012323 is an equidigital number, since it uses as much as digits as its factorization.

21000401012323 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 21000401012323 its reverse (32321010400012), we get a palindrome (53321411412335).

The spelling of 21000401012323 in words is "twenty-one trillion, four hundred one million, twelve thousand, three hundred twenty-three".