42055421 has 4 divisors (see below), whose sum is σ = 43192092. Its totient is φ = 40918752.

The previous prime is 42055411. The next prime is 42055451. The reversal of 42055421 is 12455024.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 37687321 + 4368100 = 6139^2 + 2090^2 .

It is a cyclic number.

It is not a de Polignac number, because 42055421 - 2⁶ = 42055357 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42055411) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 568280 + ... + 568353.

It is an arithmetic number, because the mean of its divisors is an integer number (10798023).

Almost surely, 2^42055421 is an apocalyptic number.

It is an amenable number.

42055421 is a deficient number, since it is larger than the sum of its proper divisors (1136671).

42055421 is a wasteful number, since it uses less digits than its factorization.

42055421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1136670.

The product of its (nonzero) digits is 1600, while the sum is 23.

The square root of 42055421 is about 6485.0151117788. The cubic root of 42055421 is about 347.7554900442.

The spelling of 42055421 in words is "forty-two million, fifty-five thousand, four hundred twenty-one".