42055121 has 2 divisors, whose sum is σ = 42055122. Its totient is φ = 42055120.

The previous prime is 42055103. The next prime is 42055147. The reversal of 42055121 is 12155024.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 37994896 + 4060225 = 6164^2 + 2015^2 .

It is a cyclic number.

It is not a de Polignac number, because 42055121 - 2²² = 37860817 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 42055093 and 42055102.

It is not a weakly prime, because it can be changed into another prime (42055921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21027560 + 21027561.

It is an arithmetic number, because the mean of its divisors is an integer number (21027561).

Almost surely, 2^42055121 is an apocalyptic number.

It is an amenable number.

42055121 is a deficient number, since it is larger than the sum of its proper divisors (1).

42055121 is an equidigital number, since it uses as much as digits as its factorization.

42055121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 42055121 is about 6484.9919814908. The cubic root of 42055121 is about 347.7546631441.

The spelling of 42055121 in words is "forty-two million, fifty-five thousand, one hundred twenty-one".