21515131442239 has 2 divisors, whose sum is σ = 21515131442240. Its totient is φ = 21515131442238.

The previous prime is 21515131442141. The next prime is 21515131442249. The reversal of 21515131442239 is 93224413151512.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21515131442239 - 2²⁵ = 21515097887807 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21515131442195 and 21515131442204.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21515131442249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10757565721119 + 10757565721120.

It is an arithmetic number, because the mean of its divisors is an integer number (10757565721120).

Almost surely, 2^{21515131442239} is an apocalyptic number.

21515131442239 is a deficient number, since it is larger than the sum of its proper divisors (1).

21515131442239 is an equidigital number, since it uses as much as digits as its factorization.

21515131442239 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 259200, while the sum is 43.

The spelling of 21515131442239 in words is "twenty-one trillion, five hundred fifteen billion, one hundred thirty-one million, four hundred forty-two thousand, two hundred thirty-nine".