21077036017 has 4 divisors (see below), whose sum is σ = 21103025776. Its totient is φ = 21051046260.

The previous prime is 21077036003. The next prime is 21077036023. The reversal of 21077036017 is 71063077012.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21077036017 - 2²⁷ = 20942818289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21077036117) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12993663 + ... + 12995284.

It is an arithmetic number, because the mean of its divisors is an integer number (5275756444).

Almost surely, 2^21077036017 is an apocalyptic number.

It is an amenable number.

21077036017 is a deficient number, since it is larger than the sum of its proper divisors (25989759).

21077036017 is an equidigital number, since it uses as much as digits as its factorization.

21077036017 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25989758.

The product of its (nonzero) digits is 12348, while the sum is 34.

The spelling of 21077036017 in words is "twenty-one billion, seventy-seven million, thirty-six thousand, seventeen".