21354625311677 has 32 divisors (see below), whose sum is σ = 26687008051200. Its totient is φ = 16679379427200.

The previous prime is 21354625311671. The next prime is 21354625311737. The reversal of 21354625311677 is 77611352645312.

It is not a de Polignac number, because 21354625311677 - 2²⁰ = 21354624263101 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21354625311671) 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, 27191177 + ... + 27965502.

It is an arithmetic number, because the mean of its divisors is an integer number (833969001600).

Almost surely, 2^{21354625311677} is an apocalyptic number.

It is an amenable number.

21354625311677 is a deficient number, since it is larger than the sum of its proper divisors (5332382739523).

21354625311677 is a wasteful number, since it uses less digits than its factorization.

21354625311677 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55156817.

The product of its digits is 6350400, while the sum is 53.

Adding to 21354625311677 its reverse (77611352645312), we get a palindrome (98965977956989).

The spelling of 21354625311677 in words is "twenty-one trillion, three hundred fifty-four billion, six hundred twenty-five million, three hundred eleven thousand, six hundred seventy-seven".