42673021 has 2 divisors, whose sum is σ = 42673022. Its totient is φ = 42673020.

The previous prime is 42672979. The next prime is 42673067. The reversal of 42673021 is 12037624.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 42055225 + 617796 = 6485^2 + 786^2 .

It is a cyclic number.

It is not a de Polignac number, because 42673021 - 2⁷ = 42672893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42673091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21336510 + 21336511.

It is an arithmetic number, because the mean of its divisors is an integer number (21336511).

Almost surely, 2^42673021 is an apocalyptic number.

It is an amenable number.

42673021 is a deficient number, since it is larger than the sum of its proper divisors (1).

42673021 is an equidigital number, since it uses as much as digits as its factorization.

42673021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2016, while the sum is 25.

The square root of 42673021 is about 6532.4590316358. The cubic root of 42673021 is about 349.4495319755.

The spelling of 42673021 in words is "forty-two million, six hundred seventy-three thousand, twenty-one".