42682021 has 4 divisors (see below), whose sum is σ = 43059852. Its totient is φ = 42304192.

The previous prime is 42682001. The next prime is 42682049. The reversal of 42682021 is 12028624.

It is a happy number.

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 3556996 + 39125025 = 1886^2 + 6255^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42682021 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 (42682001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 188746 + ... + 188971.

It is an arithmetic number, because the mean of its divisors is an integer number (10764963).

Almost surely, 2^42682021 is an apocalyptic number.

It is an amenable number.

42682021 is a deficient number, since it is larger than the sum of its proper divisors (377831).

42682021 is a wasteful number, since it uses less digits than its factorization.

42682021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 377830.

The product of its (nonzero) digits is 1536, while the sum is 25.

The square root of 42682021 is about 6533.1478630137. The cubic root of 42682021 is about 349.4740972601.

The spelling of 42682021 in words is "forty-two million, six hundred eighty-two thousand, twenty-one".