74771221 has 4 divisors (see below), whose sum is σ = 85452832. Its totient is φ = 64089612.

The previous prime is 74771171. The next prime is 74771233. The reversal of 74771221 is 12217747.

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: 12217747 = 17 ⋅718691.

It is a cyclic number.

It is not a de Polignac number, because 74771221 - 2¹¹ = 74769173 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 (74771621) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5340795 + ... + 5340808.

It is an arithmetic number, because the mean of its divisors is an integer number (21363208).

Almost surely, 2^74771221 is an apocalyptic number.

It is an amenable number.

74771221 is a deficient number, since it is larger than the sum of its proper divisors (10681611).

74771221 is a wasteful number, since it uses less digits than its factorization.

74771221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10681610.

The product of its digits is 5488, while the sum is 31.

The square root of 74771221 is about 8647.0353879234. The cubic root of 74771221 is about 421.2870966165.

Adding to 74771221 its reverse (12217747), we get a palindrome (86988968).

The spelling of 74771221 in words is "seventy-four million, seven hundred seventy-one thousand, two hundred twenty-one".