21150006239 has 2 divisors, whose sum is σ = 21150006240. Its totient is φ = 21150006238.

The previous prime is 21150006209. The next prime is 21150006257. The reversal of 21150006239 is 93260005112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21150006239 - 2¹² = 21150002143 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21150006209) 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, 10575003119 + 10575003120.

It is an arithmetic number, because the mean of its divisors is an integer number (10575003120).

Almost surely, 2^21150006239 is an apocalyptic number.

21150006239 is a deficient number, since it is larger than the sum of its proper divisors (1).

21150006239 is an equidigital number, since it uses as much as digits as its factorization.

21150006239 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3240, while the sum is 29.

The spelling of 21150006239 in words is "twenty-one billion, one hundred fifty million, six thousand, two hundred thirty-nine".