42012261 has 12 divisors (see below), whose sum is σ = 60770892. Its totient is φ = 27968256.

The previous prime is 42012259. The next prime is 42012281. The reversal of 42012261 is 16221024.

It can be written as a sum of positive squares in 2 ways, for example, as 31708161 + 10304100 = 5631^2 + 3210^2 .

It is not a de Polignac number, because 42012261 - 2¹ = 42012259 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42012221) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4245 + ... + 10101.

It is an arithmetic number, because the mean of its divisors is an integer number (5064241).

Almost surely, 2^42012261 is an apocalyptic number.

It is an amenable number.

42012261 is a deficient number, since it is larger than the sum of its proper divisors (18758631).

42012261 is a wasteful number, since it uses less digits than its factorization.

42012261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6660 (or 6657 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 42012261 is about 6481.6865860669. The cubic root of 42012261 is about 347.6364862474.

Adding to 42012261 its reverse (16221024), we get a palindrome (58233285).

The spelling of 42012261 in words is "forty-two million, twelve thousand, two hundred sixty-one".