57223221 has 8 divisors (see below), whose sum is σ = 83233824. Its totient is φ = 34680720.

The previous prime is 57223219. The next prime is 57223223. The reversal of 57223221 is 12232275.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (57223219) and next prime (57223223).

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

It is not a de Polignac number, because 57223221 - 2¹ = 57223219 is a prime.

It is a super-2 number, since 2×57223221² = 6548994043229682, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 57223191 and 57223200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57223223) 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, 866986 + ... + 867051.

It is an arithmetic number, because the mean of its divisors is an integer number (10404228).

Almost surely, 2^57223221 is an apocalyptic number.

It is an amenable number.

57223221 is a deficient number, since it is larger than the sum of its proper divisors (26010603).

57223221 is a wasteful number, since it uses less digits than its factorization.

57223221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1734051.

The product of its digits is 1680, while the sum is 24.

The square root of 57223221 is about 7564.6031620965. The cubic root of 57223221 is about 385.3518366899.

Adding to 57223221 its reverse (12232275), we get a palindrome (69455496).

The spelling of 57223221 in words is "fifty-seven million, two hundred twenty-three thousand, two hundred twenty-one".