21473164160551 has 4 divisors (see below), whose sum is σ = 22053519948712. Its totient is φ = 20892808372392.

The previous prime is 21473164160549. The next prime is 21473164160561. The reversal of 21473164160551 is 15506146137412.

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 21473164160551 - 2¹ = 21473164160549 is a prime.

It is a super-2 number, since 2×21473164160551² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21473164160561) 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, 290177894025 + ... + 290177894098.

It is an arithmetic number, because the mean of its divisors is an integer number (5513379987178).

Almost surely, 2^{21473164160551} is an apocalyptic number.

21473164160551 is a deficient number, since it is larger than the sum of its proper divisors (580355788161).

21473164160551 is an equidigital number, since it uses as much as digits as its factorization.

21473164160551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 580355788160.

The product of its (nonzero) digits is 604800, while the sum is 46.

The spelling of 21473164160551 in words is "twenty-one trillion, four hundred seventy-three billion, one hundred sixty-four million, one hundred sixty thousand, five hundred fifty-one".