54121621 has 2 divisors, whose sum is σ = 54121622. Its totient is φ = 54121620.

The previous prime is 54121619. The next prime is 54121643. The reversal of 54121621 is 12612145.

It is an a-pointer prime, because the next prime (54121643) can be obtained adding 54121621 to its sum of digits (22).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 52200625 + 1920996 = 7225^2 + 1386^2 .

It is a cyclic number.

It is not a de Polignac number, because 54121621 - 2¹ = 54121619 is a prime.

Together with 54121619, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 54121592 and 54121601.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (54121601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27060810 + 27060811.

It is an arithmetic number, because the mean of its divisors is an integer number (27060811).

Almost surely, 2^54121621 is an apocalyptic number.

It is an amenable number.

54121621 is a deficient number, since it is larger than the sum of its proper divisors (1).

54121621 is an equidigital number, since it uses as much as digits as its factorization.

54121621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 480, while the sum is 22.

The square root of 54121621 is about 7356.7398350084. The cubic root of 54121621 is about 378.2598667511.

Adding to 54121621 its reverse (12612145), we get a palindrome (66733766).

The spelling of 54121621 in words is "fifty-four million, one hundred twenty-one thousand, six hundred twenty-one".