71294221 has 2 divisors, whose sum is σ = 71294222. Its totient is φ = 71294220.

The previous prime is 71294219. The next prime is 71294233. The reversal of 71294221 is 12249217.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 35832196 + 35462025 = 5986^2 + 5955^2 .

It is a cyclic number.

It is not a de Polignac number, because 71294221 - 2¹ = 71294219 is a prime.

Together with 71294219, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 71294221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71294281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35647110 + 35647111.

It is an arithmetic number, because the mean of its divisors is an integer number (35647111).

Almost surely, 2^71294221 is an apocalyptic number.

It is an amenable number.

71294221 is a deficient number, since it is larger than the sum of its proper divisors (1).

71294221 is an equidigital number, since it uses as much as digits as its factorization.

71294221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2016, while the sum is 28.

The square root of 71294221 is about 8443.5905277317. The cubic root of 71294221 is about 414.6529657967.

The spelling of 71294221 in words is "seventy-one million, two hundred ninety-four thousand, two hundred twenty-one".