13446021997 has 2 divisors, whose sum is σ = 13446021998. Its totient is φ = 13446021996.

The previous prime is 13446021991. The next prime is 13446022123. The reversal of 13446021997 is 79912064431.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12966149161 + 479872836 = 113869^2 + 21906^2 .

It is a cyclic number.

It is not a de Polignac number, because 13446021997 - 2³ = 13446021989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13446021991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6723010998 + 6723010999.

It is an arithmetic number, because the mean of its divisors is an integer number (6723010999).

Almost surely, 2^13446021997 is an apocalyptic number.

It is an amenable number.

13446021997 is a deficient number, since it is larger than the sum of its proper divisors (1).

13446021997 is an equidigital number, since it uses as much as digits as its factorization.

13446021997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 326592, while the sum is 46.

The spelling of 13446021997 in words is "thirteen billion, four hundred forty-six million, twenty-one thousand, nine hundred ninety-seven".