21470546417377 has 4 divisors (see below), whose sum is σ = 21493075847940. Its totient is φ = 21448016986816.

The previous prime is 21470546417329. The next prime is 21470546417393. The reversal of 21470546417377 is 77371464507412.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8124500823201 + 13346045594176 = 2850351^2 + 3653224^2 .

It is a cyclic number.

It is not a de Polignac number, because 21470546417377 - 2¹⁹ = 21470545893089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21470546417977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11264713852 + ... + 11264715757.

It is an arithmetic number, because the mean of its divisors is an integer number (5373268961985).

Almost surely, 2^{21470546417377} is an apocalyptic number.

It is an amenable number.

21470546417377 is a deficient number, since it is larger than the sum of its proper divisors (22529430563).

21470546417377 is an equidigital number, since it uses as much as digits as its factorization.

21470546417377 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22529430562.

The product of its (nonzero) digits is 27659520, while the sum is 58.

The spelling of 21470546417377 in words is "twenty-one trillion, four hundred seventy billion, five hundred forty-six million, four hundred seventeen thousand, three hundred seventy-seven".