21210000161 has 8 divisors (see below), whose sum is σ = 24380117184. Its totient is φ = 18074912400.

The previous prime is 21210000109. The next prime is 21210000167. The reversal of 21210000161 is 16100001212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21210000161 is a prime.

It is a super-3 number, since 3×21210000161³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21210000167) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8756015 + ... + 8758436.

It is an arithmetic number, because the mean of its divisors is an integer number (3047514648).

Almost surely, 2^21210000161 is an apocalyptic number.

It is an amenable number.

21210000161 is a deficient number, since it is larger than the sum of its proper divisors (3170117023).

21210000161 is a wasteful number, since it uses less digits than its factorization.

21210000161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17514631.

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 21210000161 its reverse (16100001212), we get a palindrome (37310001373).

The spelling of 21210000161 in words is "twenty-one billion, two hundred ten million, one hundred sixty-one", and thus it is an aban number.