42533921 has 2 divisors, whose sum is σ = 42533922. Its totient is φ = 42533920.

The previous prime is 42533903. The next prime is 42533941. The reversal of 42533921 is 12933524.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 38688400 + 3845521 = 6220^2 + 1961^2 .

It is a cyclic number.

It is not a de Polignac number, because 42533921 - 2¹⁴ = 42517537 is a prime.

It is not a weakly prime, because it can be changed into another prime (42533941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21266960 + 21266961.

It is an arithmetic number, because the mean of its divisors is an integer number (21266961).

Almost surely, 2^42533921 is an apocalyptic number.

It is an amenable number.

42533921 is a deficient number, since it is larger than the sum of its proper divisors (1).

42533921 is an equidigital number, since it uses as much as digits as its factorization.

42533921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6480, while the sum is 29.

The square root of 42533921 is about 6521.8035082330. The cubic root of 42533921 is about 349.0694218541.

The spelling of 42533921 in words is "forty-two million, five hundred thirty-three thousand, nine hundred twenty-one".