1057221217 has 4 divisors (see below), whose sum is σ = 1138545940. Its totient is φ = 975896496.

The previous prime is 1057221167. The next prime is 1057221227. The reversal of 1057221217 is 7121227501.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 82283041 + 974938176 = 9071^2 + 31224^2 .

It is a cyclic number.

It is not a de Polignac number, because 1057221217 - 2¹¹ = 1057219169 is a prime.

It is a super-2 number, since 2×1057221217² = 2235433403349922178, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1057221227) 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, 40662342 + ... + 40662367.

It is an arithmetic number, because the mean of its divisors is an integer number (284636485).

Almost surely, 2^1057221217 is an apocalyptic number.

It is an amenable number.

1057221217 is a deficient number, since it is larger than the sum of its proper divisors (81324723).

1057221217 is an equidigital number, since it uses as much as digits as its factorization.

1057221217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81324722.

The product of its (nonzero) digits is 1960, while the sum is 28.

The square root of 1057221217 is about 32514.9383668492. The cubic root of 1057221217 is about 1018.7210733026.

Adding to 1057221217 its reverse (7121227501), we get a palindrome (8178448718).

The spelling of 1057221217 in words is "one billion, fifty-seven million, two hundred twenty-one thousand, two hundred seventeen".