21345130679 has 2 divisors, whose sum is σ = 21345130680. Its totient is φ = 21345130678.

The previous prime is 21345130661. The next prime is 21345130711. The reversal of 21345130679 is 97603154312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21345130679 - 2²⁸ = 21076695223 is a prime.

It is a super-2 number, since 2×21345130679² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21345130379) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10672565339 + 10672565340.

It is an arithmetic number, because the mean of its divisors is an integer number (10672565340).

Almost surely, 2^21345130679 is an apocalyptic number.

21345130679 is a deficient number, since it is larger than the sum of its proper divisors (1).

21345130679 is an equidigital number, since it uses as much as digits as its factorization.

21345130679 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 136080, while the sum is 41.

The spelling of 21345130679 in words is "twenty-one billion, three hundred forty-five million, one hundred thirty thousand, six hundred seventy-nine".