54242021 has 2 divisors, whose sum is σ = 54242022. Its totient is φ = 54242020.

The previous prime is 54242003. The next prime is 54242047. The reversal of 54242021 is 12024245.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 49773025 + 4468996 = 7055^2 + 2114^2 .

It is a cyclic number.

It is not a de Polignac number, because 54242021 - 2¹⁴ = 54225637 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 54241984 and 54242002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (54242051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27121010 + 27121011.

It is an arithmetic number, because the mean of its divisors is an integer number (27121011).

Almost surely, 2^54242021 is an apocalyptic number.

It is an amenable number.

54242021 is a deficient number, since it is larger than the sum of its proper divisors (1).

54242021 is an equidigital number, since it uses as much as digits as its factorization.

54242021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 640, while the sum is 20.

The square root of 54242021 is about 7364.9182615967. The cubic root of 54242021 is about 378.5401537370.

Adding to 54242021 its reverse (12024245), we get a palindrome (66266266).

The spelling of 54242021 in words is "fifty-four million, two hundred forty-two thousand, twenty-one".