21323212039 has 2 divisors, whose sum is σ = 21323212040. Its totient is φ = 21323212038.

The previous prime is 21323212003. The next prime is 21323212049. The reversal of 21323212039 is 93021232312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21323212039 - 2²⁵ = 21289657607 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21323211998 and 21323212016.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21323212049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10661606019 + 10661606020.

It is an arithmetic number, because the mean of its divisors is an integer number (10661606020).

Almost surely, 2^21323212039 is an apocalyptic number.

21323212039 is a deficient number, since it is larger than the sum of its proper divisors (1).

21323212039 is an equidigital number, since it uses as much as digits as its factorization.

21323212039 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3888, while the sum is 28.

The spelling of 21323212039 in words is "twenty-one billion, three hundred twenty-three million, two hundred twelve thousand, thirty-nine".