21214580054621 has 2 divisors, whose sum is σ = 21214580054622. Its totient is φ = 21214580054620.

The previous prime is 21214580054609. The next prime is 21214580054779. The reversal of 21214580054621 is 12645008541212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13773087086521 + 7441492968100 = 3711211^2 + 2727910^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21214580054621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21214580054321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10607290027310 + 10607290027311.

It is an arithmetic number, because the mean of its divisors is an integer number (10607290027311).

Almost surely, 2^{21214580054621} is an apocalyptic number.

It is an amenable number.

21214580054621 is a deficient number, since it is larger than the sum of its proper divisors (1).

21214580054621 is an equidigital number, since it uses as much as digits as its factorization.

21214580054621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 153600, while the sum is 41.

Adding to 21214580054621 its reverse (12645008541212), we get a palindrome (33859588595833).

The spelling of 21214580054621 in words is "twenty-one trillion, two hundred fourteen billion, five hundred eighty million, fifty-four thousand, six hundred twenty-one".