21466161611 has 4 divisors (see below), whose sum is σ = 21467386512. Its totient is φ = 21464936712.

The previous prime is 21466161583. The next prime is 21466161653. The reversal of 21466161611 is 11616166412.

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

It is a cyclic number.

It is not a de Polignac number, because 21466161611 - 2⁶ = 21466161547 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21466163611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 585776 + ... + 621341.

It is an arithmetic number, because the mean of its divisors is an integer number (5366846628).

Almost surely, 2^21466161611 is an apocalyptic number.

21466161611 is a deficient number, since it is larger than the sum of its proper divisors (1224901).

21466161611 is a wasteful number, since it uses less digits than its factorization.

21466161611 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1224900.

The product of its digits is 10368, while the sum is 35.

The spelling of 21466161611 in words is "twenty-one billion, four hundred sixty-six million, one hundred sixty-one thousand, six hundred eleven".