42773021 has 4 divisors (see below), whose sum is σ = 42812700. Its totient is φ = 42733344.

The previous prime is 42773011. The next prime is 42773033. The reversal of 42773021 is 12037724.

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 11256025 + 31516996 = 3355^2 + 5614^2 .

It is a cyclic number.

It is not a de Polignac number, because 42773021 - 2¹⁰ = 42771997 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 (42773011) 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, 18176 + ... + 20393.

It is an arithmetic number, because the mean of its divisors is an integer number (10703175).

Almost surely, 2^42773021 is an apocalyptic number.

It is an amenable number.

42773021 is a deficient number, since it is larger than the sum of its proper divisors (39679).

42773021 is a wasteful number, since it uses less digits than its factorization.

42773021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39678.

The product of its (nonzero) digits is 2352, while the sum is 26.

The square root of 42773021 is about 6540.1086382414. The cubic root of 42773021 is about 349.7222858231.

The spelling of 42773021 in words is "forty-two million, seven hundred seventy-three thousand, twenty-one".