42235821 has 6 divisors (see below), whose sum is σ = 61007310. Its totient is φ = 28157208.

The previous prime is 42235819. The next prime is 42235901. The reversal of 42235821 is 12853224.

It can be written as a sum of positive squares in only one way, i.e., 33767721 + 8468100 = 5811^2 + 2910^2 .

It is not a de Polignac number, because 42235821 - 2¹ = 42235819 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42235801) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2346426 + ... + 2346443.

It is an arithmetic number, because the mean of its divisors is an integer number (10167885).

Almost surely, 2^42235821 is an apocalyptic number.

It is an amenable number.

42235821 is a deficient number, since it is larger than the sum of its proper divisors (18771489).

42235821 is a wasteful number, since it uses less digits than its factorization.

42235821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4692875 (or 4692872 counting only the distinct ones).

The product of its digits is 3840, while the sum is 27.

The square root of 42235821 is about 6498.9092161685. The cubic root of 42235821 is about 348.2520221577.

The spelling of 42235821 in words is "forty-two million, two hundred thirty-five thousand, eight hundred twenty-one".