21073437071 has 2 divisors, whose sum is σ = 21073437072. Its totient is φ = 21073437070.

The previous prime is 21073436983. The next prime is 21073437097. The reversal of 21073437071 is 17073437012.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21073437071 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21073437271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10536718535 + 10536718536.

It is an arithmetic number, because the mean of its divisors is an integer number (10536718536).

Almost surely, 2^21073437071 is an apocalyptic number.

21073437071 is a deficient number, since it is larger than the sum of its proper divisors (1).

21073437071 is an equidigital number, since it uses as much as digits as its factorization.

21073437071 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24696, while the sum is 35.

The spelling of 21073437071 in words is "twenty-one billion, seventy-three million, four hundred thirty-seven thousand, seventy-one".