21076067797 has 2 divisors, whose sum is σ = 21076067798. Its totient is φ = 21076067796.

The previous prime is 21076067783. The next prime is 21076067827. The reversal of 21076067797 is 79776067012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16725214276 + 4350853521 = 129326^2 + 65961^2 .

It is a cyclic number.

It is not a de Polignac number, because 21076067797 - 2¹⁹ = 21075543509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21076067717) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10538033898 + 10538033899.

It is an arithmetic number, because the mean of its divisors is an integer number (10538033899).

Almost surely, 2^21076067797 is an apocalyptic number.

It is an amenable number.

21076067797 is a deficient number, since it is larger than the sum of its proper divisors (1).

21076067797 is an equidigital number, since it uses as much as digits as its factorization.

21076067797 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1555848, while the sum is 52.

The spelling of 21076067797 in words is "twenty-one billion, seventy-six million, sixty-seven thousand, seven hundred ninety-seven".