21230023289 has 2 divisors, whose sum is σ = 21230023290. Its totient is φ = 21230023288.

The previous prime is 21230023271. The next prime is 21230023313. The reversal of 21230023289 is 98232003212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21054010000 + 176013289 = 145100^2 + 13267^2 .

It is a cyclic number.

It is not a de Polignac number, because 21230023289 - 2⁸ = 21230023033 is a prime.

It is not a weakly prime, because it can be changed into another prime (21230023189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10615011644 + 10615011645.

It is an arithmetic number, because the mean of its divisors is an integer number (10615011645).

Almost surely, 2^21230023289 is an apocalyptic number.

It is an amenable number.

21230023289 is a deficient number, since it is larger than the sum of its proper divisors (1).

21230023289 is an equidigital number, since it uses as much as digits as its factorization.

21230023289 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 32.

The spelling of 21230023289 in words is "twenty-one billion, two hundred thirty million, twenty-three thousand, two hundred eighty-nine".