21621351034161 has 48 divisors (see below), whose sum is σ = 32446249932096. Its totient is φ = 14388112783296.

The previous prime is 21621351034141. The next prime is 21621351034183. The reversal of 21621351034161 is 16143015312612.

21621351034161 is a `hidden beast` number, since 2 + 1 + 6 + 2 + 135 + 103 + 416 + 1 = 666.

It is not a de Polignac number, because 21621351034161 - 2⁷ = 21621351034033 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21621351034111) 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 47 ways as a sum of consecutive naturals, for example, 1174234591 + ... + 1174253003.

It is an arithmetic number, because the mean of its divisors is an integer number (675963540252).

Almost surely, 2^{21621351034161} is an apocalyptic number.

It is an amenable number.

21621351034161 is a deficient number, since it is larger than the sum of its proper divisors (10824898897935).

21621351034161 is an equidigital number, since it uses as much as digits as its factorization.

21621351034161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26924 (or 26912 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

Adding to 21621351034161 its reverse (16143015312612), we get a palindrome (37764366346773).

The spelling of 21621351034161 in words is "twenty-one trillion, six hundred twenty-one billion, three hundred fifty-one million, thirty-four thousand, one hundred sixty-one".