21002350223 has 2 divisors, whose sum is σ = 21002350224. Its totient is φ = 21002350222.

The previous prime is 21002350181. The next prime is 21002350231. The reversal of 21002350223 is 32205320012.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21002350223 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21002350195 and 21002350204.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21002350123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10501175111 + 10501175112.

It is an arithmetic number, because the mean of its divisors is an integer number (10501175112).

Almost surely, 2^21002350223 is an apocalyptic number.

21002350223 is a deficient number, since it is larger than the sum of its proper divisors (1).

21002350223 is an equidigital number, since it uses as much as digits as its factorization.

21002350223 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 720, while the sum is 20.

Adding to 21002350223 its reverse (32205320012), we get a palindrome (53207670235).

The spelling of 21002350223 in words is "twenty-one billion, two million, three hundred fifty thousand, two hundred twenty-three".