21213554610161 has 32 divisors (see below), whose sum is σ = 23850926668800. Its totient is φ = 18773620992000.

The previous prime is 21213554610091. The next prime is 21213554610323. The reversal of 21213554610161 is 16101645531212.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21213554610161 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21213554610461) 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 31 ways as a sum of consecutive naturals, for example, 72294101 + ... + 72586941.

It is an arithmetic number, because the mean of its divisors is an integer number (745341458400).

Almost surely, 2^{21213554610161} is an apocalyptic number.

It is an amenable number.

21213554610161 is a deficient number, since it is larger than the sum of its proper divisors (2637372058639).

21213554610161 is a wasteful number, since it uses less digits than its factorization.

21213554610161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 297161.

The product of its (nonzero) digits is 43200, while the sum is 38.

The spelling of 21213554610161 in words is "twenty-one trillion, two hundred thirteen billion, five hundred fifty-four million, six hundred ten thousand, one hundred sixty-one".