21021110239 has 2 divisors, whose sum is σ = 21021110240. Its totient is φ = 21021110238.

The previous prime is 21021110197. The next prime is 21021110281. The reversal of 21021110239 is 93201112012.

It is a balanced prime because it is at equal distance from previous prime (21021110197) and next prime (21021110281).

It is a cyclic number.

It is not a de Polignac number, because 21021110239 - 2⁹ = 21021109727 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21021114239) 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, 10510555119 + 10510555120.

It is an arithmetic number, because the mean of its divisors is an integer number (10510555120).

Almost surely, 2^21021110239 is an apocalyptic number.

21021110239 is a deficient number, since it is larger than the sum of its proper divisors (1).

21021110239 is an equidigital number, since it uses as much as digits as its factorization.

21021110239 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 22.

The spelling of 21021110239 in words is "twenty-one billion, twenty-one million, one hundred ten thousand, two hundred thirty-nine".