71220213 has 24 divisors (see below), whose sum is σ = 108483648. Its totient is φ = 44934912.

The previous prime is 71220209. The next prime is 71220217. The reversal of 71220213 is 31202217.

It is an interprime number because it is at equal distance from previous prime (71220209) and next prime (71220217).

It is not a de Polignac number, because 71220213 - 2² = 71220209 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71220217) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18306 + ... + 21852.

It is an arithmetic number, because the mean of its divisors is an integer number (4520152).

Almost surely, 2^71220213 is an apocalyptic number.

It is an amenable number.

71220213 is a deficient number, since it is larger than the sum of its proper divisors (37263435).

71220213 is a wasteful number, since it uses less digits than its factorization.

71220213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3673 (or 3670 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 18.

The square root of 71220213 is about 8439.2068940156. The cubic root of 71220213 is about 414.5094372799.

The spelling of 71220213 in words is "seventy-one million, two hundred twenty thousand, two hundred thirteen".