21506142715319 has 2 divisors, whose sum is σ = 21506142715320. Its totient is φ = 21506142715318.

The previous prime is 21506142715297. The next prime is 21506142715349. The reversal of 21506142715319 is 91351724160512.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21506142715319 - 2⁸ = 21506142715063 is a prime.

It is a super-2 number, since 2×21506142715319² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21506142715349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10753071357659 + 10753071357660.

It is an arithmetic number, because the mean of its divisors is an integer number (10753071357660).

Almost surely, 2^{21506142715319} is an apocalyptic number.

21506142715319 is a deficient number, since it is larger than the sum of its proper divisors (1).

21506142715319 is an equidigital number, since it uses as much as digits as its factorization.

21506142715319 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 453600, while the sum is 47.

The spelling of 21506142715319 in words is "twenty-one trillion, five hundred six billion, one hundred forty-two million, seven hundred fifteen thousand, three hundred nineteen".