442050021 has 24 divisors (see below), whose sum is σ = 761811840. Its totient is φ = 252599256.

The previous prime is 442050017. The next prime is 442050053. The reversal of 442050021 is 120050244.

It is not a de Polignac number, because 442050021 - 2² = 442050017 is a prime.

It is a super-2 number, since 2×442050021² = 390816442132200882, which contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 442049976 and 442050003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (442050821) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 165741 + ... + 168386.

It is an arithmetic number, because the mean of its divisors is an integer number (31742160).

Almost surely, 2^442050021 is an apocalyptic number.

It is an amenable number.

442050021 is a deficient number, since it is larger than the sum of its proper divisors (319761819).

442050021 is a wasteful number, since it uses less digits than its factorization.

442050021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 334150 (or 334137 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 18.

The square root of 442050021 is about 21024.9856361425. The cubic root of 442050021 is about 761.7698945607.

The spelling of 442050021 in words is "four hundred forty-two million, fifty thousand, twenty-one".