21320152723 has 2 divisors, whose sum is σ = 21320152724. Its totient is φ = 21320152722.

The previous prime is 21320152709. The next prime is 21320152747. The reversal of 21320152723 is 32725102312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21320152723 - 2²⁹ = 20783281811 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21320152691 and 21320152700.

It is not a weakly prime, because it can be changed into another prime (21320152793) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10660076361 + 10660076362.

It is an arithmetic number, because the mean of its divisors is an integer number (10660076362).

Almost surely, 2^21320152723 is an apocalyptic number.

21320152723 is a deficient number, since it is larger than the sum of its proper divisors (1).

21320152723 is an equidigital number, since it uses as much as digits as its factorization.

21320152723 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5040, while the sum is 28.

The spelling of 21320152723 in words is "twenty-one billion, three hundred twenty million, one hundred fifty-two thousand, seven hundred twenty-three".