21072145067 has 2 divisors, whose sum is σ = 21072145068. Its totient is φ = 21072145066.

The previous prime is 21072145049. The next prime is 21072145123. The reversal of 21072145067 is 76054127012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21072145067 - 2¹⁰ = 21072144043 is a prime.

It is not a weakly prime, because it can be changed into another prime (21072145667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10536072533 + 10536072534.

It is an arithmetic number, because the mean of its divisors is an integer number (10536072534).

Almost surely, 2^21072145067 is an apocalyptic number.

21072145067 is a deficient number, since it is larger than the sum of its proper divisors (1).

21072145067 is an equidigital number, since it uses as much as digits as its factorization.

21072145067 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23520, while the sum is 35.

The spelling of 21072145067 in words is "twenty-one billion, seventy-two million, one hundred forty-five thousand, sixty-seven".