71046221 has 4 divisors (see below), whose sum is σ = 72046944. Its totient is φ = 70045500.

The previous prime is 71046211. The next prime is 71046223. The reversal of 71046221 is 12264017.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12264017 = 181 ⋅67757.

It is a cyclic number.

It is not a de Polignac number, because 71046221 - 2²⁶ = 3937357 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 (71046223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 500255 + ... + 500396.

It is an arithmetic number, because the mean of its divisors is an integer number (18011736).

Almost surely, 2^71046221 is an apocalyptic number.

71046221 is a gapful number since it is divisible by the number (71) formed by its first and last digit.

It is an amenable number.

71046221 is a deficient number, since it is larger than the sum of its proper divisors (1000723).

71046221 is a wasteful number, since it uses less digits than its factorization.

71046221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1000722.

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 71046221 is about 8428.8920386964. The cubic root of 71046221 is about 414.1716111958.

The spelling of 71046221 in words is "seventy-one million, forty-six thousand, two hundred twenty-one".