21126465071 has 2 divisors, whose sum is σ = 21126465072. Its totient is φ = 21126465070.

The previous prime is 21126465049. The next prime is 21126465109. The reversal of 21126465071 is 17056462112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21126465071 - 2⁶ = 21126465007 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21126461071) 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, 10563232535 + 10563232536.

It is an arithmetic number, because the mean of its divisors is an integer number (10563232536).

Almost surely, 2^21126465071 is an apocalyptic number.

21126465071 is a deficient number, since it is larger than the sum of its proper divisors (1).

21126465071 is an equidigital number, since it uses as much as digits as its factorization.

21126465071 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20160, while the sum is 35.

The spelling of 21126465071 in words is "twenty-one billion, one hundred twenty-six million, four hundred sixty-five thousand, seventy-one".