71266221 has 12 divisors (see below), whose sum is σ = 110858748. Its totient is φ = 43856064.

The previous prime is 71266219. The next prime is 71266231. The reversal of 71266221 is 12266217.

It can be written as a sum of positive squares in 2 ways, for example, as 24890121 + 46376100 = 4989^2 + 6810^2 .

It is not a de Polignac number, because 71266221 - 2¹ = 71266219 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71266211) 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, 304440 + ... + 304673.

It is an arithmetic number, because the mean of its divisors is an integer number (9238229).

Almost surely, 2^71266221 is an apocalyptic number.

It is an amenable number.

71266221 is a deficient number, since it is larger than the sum of its proper divisors (39592527).

71266221 is a wasteful number, since it uses less digits than its factorization.

71266221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 609132 (or 609129 counting only the distinct ones).

The product of its digits is 2016, while the sum is 27.

The square root of 71266221 is about 8441.9323025004. The cubic root of 71266221 is about 414.5986752659.

The spelling of 71266221 in words is "seventy-one million, two hundred sixty-six thousand, two hundred twenty-one".