13443677021 has 2 divisors, whose sum is σ = 13443677022. Its totient is φ = 13443677020.

The previous prime is 13443677017. The next prime is 13443677029. The reversal of 13443677021 is 12077634431.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13254916900 + 188760121 = 115130^2 + 13739^2 .

It is a cyclic number.

It is not a de Polignac number, because 13443677021 - 2² = 13443677017 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13443677029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6721838510 + 6721838511.

It is an arithmetic number, because the mean of its divisors is an integer number (6721838511).

Almost surely, 2^13443677021 is an apocalyptic number.

It is an amenable number.

13443677021 is a deficient number, since it is larger than the sum of its proper divisors (1).

13443677021 is an equidigital number, since it uses as much as digits as its factorization.

13443677021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 84672, while the sum is 38.

The spelling of 13443677021 in words is "thirteen billion, four hundred forty-three million, six hundred seventy-seven thousand, twenty-one".