4142021 has 6 divisors (see below), whose sum is σ = 4485330. Its totient is φ = 3823248.

The previous prime is 4142011. The next prime is 4142023. The reversal of 4142021 is 1202414.

It can be written as a sum of positive squares in 3 ways, for example, as 261121 + 3880900 = 511^2 + 1970^2 .

It is not a de Polignac number, because 4142021 - 2⁶ = 4141957 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 4141987 and 4142005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4142023) 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, 12086 + ... + 12423.

It is an arithmetic number, because the mean of its divisors is an integer number (747555).

Almost surely, 2^4142021 is an apocalyptic number.

It is an amenable number.

4142021 is a deficient number, since it is larger than the sum of its proper divisors (343309).

4142021 is a wasteful number, since it uses less digits than its factorization.

4142021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24535 (or 24522 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 4142021 is about 2035.1955679983. The cubic root of 4142021 is about 160.5970014333.

Adding to 4142021 its reverse (1202414), we get a palindrome (5344435).

The spelling of 4142021 in words is "four million, one hundred forty-two thousand, twenty-one".