42925021 has 2 divisors, whose sum is σ = 42925022. Its totient is φ = 42925020.

The previous prime is 42925013. The next prime is 42925031. The reversal of 42925021 is 12052924.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39200121 + 3724900 = 6261^2 + 1930^2 .

It is a cyclic number.

It is not a de Polignac number, because 42925021 - 2³ = 42925013 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42925031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21462510 + 21462511.

It is an arithmetic number, because the mean of its divisors is an integer number (21462511).

Almost surely, 2^42925021 is an apocalyptic number.

It is an amenable number.

42925021 is a deficient number, since it is larger than the sum of its proper divisors (1).

42925021 is an equidigital number, since it uses as much as digits as its factorization.

42925021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 42925021 is about 6551.7189347529. The cubic root of 42925021 is about 350.1360586665.

Adding to 42925021 its reverse (12052924), we get a palindrome (54977945).

The spelling of 42925021 in words is "forty-two million, nine hundred twenty-five thousand, twenty-one".