21000140323 has 2 divisors, whose sum is σ = 21000140324. Its totient is φ = 21000140322.

The previous prime is 21000140321. The next prime is 21000140333. The reversal of 21000140323 is 32304100012.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21000140323 - 2¹ = 21000140321 is a prime.

Together with 21000140321, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 21000140297 and 21000140306.

It is not a weakly prime, because it can be changed into another prime (21000140321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10500070161 + 10500070162.

It is an arithmetic number, because the mean of its divisors is an integer number (10500070162).

Almost surely, 2^21000140323 is an apocalyptic number.

21000140323 is a deficient number, since it is larger than the sum of its proper divisors (1).

21000140323 is an equidigital number, since it uses as much as digits as its factorization.

21000140323 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 16.

Adding to 21000140323 its reverse (32304100012), we get a palindrome (53304240335).

The spelling of 21000140323 in words is "twenty-one billion, one hundred forty thousand, three hundred twenty-three".