42037021 has 4 divisors (see below), whose sum is σ = 45270652. Its totient is φ = 38803392.

The previous prime is 42037019. The next prime is 42037027. The reversal of 42037021 is 12073024.

42037021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 20748025 + 21288996 = 4555^2 + 4614^2 .

It is a cyclic number.

It is not a de Polignac number, because 42037021 - 2¹ = 42037019 is a prime.

It is a super-2 number, since 2×42037021² = 3534222269108882, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 42037021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42037027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1616796 + ... + 1616821.

It is an arithmetic number, because the mean of its divisors is an integer number (11317663).

Almost surely, 2^42037021 is an apocalyptic number.

It is an amenable number.

42037021 is a deficient number, since it is larger than the sum of its proper divisors (3233631).

42037021 is a wasteful number, since it uses less digits than its factorization.

42037021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3233630.

The product of its (nonzero) digits is 336, while the sum is 19.

The square root of 42037021 is about 6483.5963014364. The cubic root of 42037021 is about 347.7047662273.

The spelling of 42037021 in words is "forty-two million, thirty-seven thousand, twenty-one".