74711221 has 8 divisors (see below), whose sum is σ = 83233080. Its totient is φ = 66585792.

The previous prime is 74711207. The next prime is 74711227. The reversal of 74711221 is 12211747.

It can be written as a sum of positive squares in 4 ways, for example, as 16112196 + 58599025 = 4014^2 + 7655^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 74711221 - 2¹³ = 74703029 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 (74711227) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 98710 + ... + 99463.

It is an arithmetic number, because the mean of its divisors is an integer number (10404135).

Almost surely, 2^74711221 is an apocalyptic number.

It is an amenable number.

74711221 is a deficient number, since it is larger than the sum of its proper divisors (8521859).

74711221 is a wasteful number, since it uses less digits than its factorization.

74711221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198215.

The product of its digits is 784, while the sum is 25.

The square root of 74711221 is about 8643.5652944835. The cubic root of 74711221 is about 421.1743794967.

Adding to 74711221 its reverse (12211747), we get a palindrome (86922968).

It can be divided in two parts, 74711 and 221, that multiplied together give a triangular number (16511131 = T₅₇₄₆).

The spelling of 74711221 in words is "seventy-four million, seven hundred eleven thousand, two hundred twenty-one".