21071380579 has 2 divisors, whose sum is σ = 21071380580. Its totient is φ = 21071380578.

The previous prime is 21071380567. The next prime is 21071380591. The reversal of 21071380579 is 97508317012.

It is a balanced prime because it is at equal distance from previous prime (21071380567) and next prime (21071380591).

It is a cyclic number.

It is not a de Polignac number, because 21071380579 - 2²¹ = 21069283427 is a prime.

It is not a weakly prime, because it can be changed into another prime (21071380549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10535690289 + 10535690290.

It is an arithmetic number, because the mean of its divisors is an integer number (10535690290).

Almost surely, 2^21071380579 is an apocalyptic number.

21071380579 is a deficient number, since it is larger than the sum of its proper divisors (1).

21071380579 is an equidigital number, since it uses as much as digits as its factorization.

21071380579 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 105840, while the sum is 43.

The spelling of 21071380579 in words is "twenty-one billion, seventy-one million, three hundred eighty thousand, five hundred seventy-nine".