54721421 has 2 divisors, whose sum is σ = 54721422. Its totient is φ = 54721420.

The previous prime is 54721411. The next prime is 54721423. The reversal of 54721421 is 12412745.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 37039396 + 17682025 = 6086^2 + 4205^2 .

It is a cyclic number.

It is not a de Polignac number, because 54721421 - 2¹⁰ = 54720397 is a prime.

Together with 54721423, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (54721423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27360710 + 27360711.

It is an arithmetic number, because the mean of its divisors is an integer number (27360711).

Almost surely, 2^54721421 is an apocalyptic number.

It is an amenable number.

54721421 is a deficient number, since it is larger than the sum of its proper divisors (1).

54721421 is an equidigital number, since it uses as much as digits as its factorization.

54721421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2240, while the sum is 26.

The square root of 54721421 is about 7397.3928515390. The cubic root of 54721421 is about 379.6520846045.

The spelling of 54721421 in words is "fifty-four million, seven hundred twenty-one thousand, four hundred twenty-one".