21203022823 has 2 divisors, whose sum is σ = 21203022824. Its totient is φ = 21203022822.

The previous prime is 21203022713. The next prime is 21203022889. The reversal of 21203022823 is 32822030212.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21203022823 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21203052823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10601511411 + 10601511412.

It is an arithmetic number, because the mean of its divisors is an integer number (10601511412).

Almost surely, 2^21203022823 is an apocalyptic number.

21203022823 is a deficient number, since it is larger than the sum of its proper divisors (1).

21203022823 is an equidigital number, since it uses as much as digits as its factorization.

21203022823 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2304, while the sum is 25.

The spelling of 21203022823 in words is "twenty-one billion, two hundred three million, twenty-two thousand, eight hundred twenty-three".