21161016463 has 4 divisors (see below), whose sum is σ = 21358783080. Its totient is φ = 20963249848.

The previous prime is 21161016403. The next prime is 21161016491. The reversal of 21161016463 is 36461016112.

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 21161016463 - 2⁹ = 21161015951 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21161016403) 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, 98883148 + ... + 98883361.

It is an arithmetic number, because the mean of its divisors is an integer number (5339695770).

Almost surely, 2^21161016463 is an apocalyptic number.

21161016463 is a deficient number, since it is larger than the sum of its proper divisors (197766617).

21161016463 is a wasteful number, since it uses less digits than its factorization.

21161016463 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 197766616.

The product of its (nonzero) digits is 5184, while the sum is 31.

The spelling of 21161016463 in words is "twenty-one billion, one hundred sixty-one million, sixteen thousand, four hundred sixty-three".