42088021 has 4 divisors (see below), whose sum is σ = 44303200. Its totient is φ = 39872844.

The previous prime is 42088003. The next prime is 42088027. The reversal of 42088021 is 12088024.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 42088021 - 2⁷ = 42087893 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 (42088027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1107561 + ... + 1107598.

It is an arithmetic number, because the mean of its divisors is an integer number (11075800).

Almost surely, 2^42088021 is an apocalyptic number.

It is an amenable number.

42088021 is a deficient number, since it is larger than the sum of its proper divisors (2215179).

42088021 is a wasteful number, since it uses less digits than its factorization.

42088021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2215178.

The product of its (nonzero) digits is 1024, while the sum is 25.

The square root of 42088021 is about 6487.5281116925. The cubic root of 42088021 is about 347.8453230999.

It can be divided in two parts, 4 and 2088021, that added together give a square (2088025 = 1445²).

The spelling of 42088021 in words is "forty-two million, eighty-eight thousand, twenty-one".