21364171447634 has 32 divisors (see below), whose sum is σ = 32314639523760. Its totient is φ = 10592796653568.

The previous prime is 21364171447631. The next prime is 21364171447637. The reversal of 21364171447634 is 43674417146312.

It is an interprime number because it is at equal distance from previous prime (21364171447631) and next prime (21364171447637).

It can be written as a sum of positive squares in 8 ways, for example, as 4614346498609 + 16749824949025 = 2148103^2 + 4092655^2 .

It is not an unprimeable number, because it can be changed into a prime (21364171447631) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1605235772 + ... + 1605249080.

Almost surely, 2^{21364171447634} is an apocalyptic number.

21364171447634 is a deficient number, since it is larger than the sum of its proper divisors (10950468076126).

21364171447634 is a wasteful number, since it uses less digits than its factorization.

21364171447634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19262.

The product of its digits is 8128512, while the sum is 53.

The spelling of 21364171447634 in words is "twenty-one trillion, three hundred sixty-four billion, one hundred seventy-one million, four hundred forty-seven thousand, six hundred thirty-four".