118221057 has 6 divisors (see below), whose sum is σ = 170763762. Its totient is φ = 78814032.

The previous prime is 118221053. The next prime is 118221083. The reversal of 118221057 is 750122811.

It can be written as a sum of positive squares in only one way, i.e., 106688241 + 11532816 = 10329^2 + 3396^2 .

It is not a de Polignac number, because 118221057 - 2² = 118221053 is a prime.

It is a super-3 number, since 3×118221057³ (a number of 25 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 118221057.

It is not an unprimeable number, because it can be changed into a prime (118221053) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6567828 + ... + 6567845.

It is an arithmetic number, because the mean of its divisors is an integer number (28460627).

Almost surely, 2^118221057 is an apocalyptic number.

It is an amenable number.

118221057 is a deficient number, since it is larger than the sum of its proper divisors (52542705).

118221057 is a wasteful number, since it uses less digits than its factorization.

118221057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13135679 (or 13135676 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 27.

The square root of 118221057 is about 10872.9507034659. The cubic root of 118221057 is about 490.7929089348.

Adding to 118221057 its reverse (750122811), we get a palindrome (868343868).

The spelling of 118221057 in words is "one hundred eighteen million, two hundred twenty-one thousand, fifty-seven".