221047057 has 16 divisors (see below), whose sum is σ = 276048000. Its totient is φ = 171959040.

The previous prime is 221047049. The next prime is 221047067. The reversal of 221047057 is 750740122.

It is not a de Polignac number, because 221047057 - 2³ = 221047049 is a prime.

It is a super-2 number, since 2×221047057² = 97723602816722498, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221047027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 52569 + ... + 56617.

It is an arithmetic number, because the mean of its divisors is an integer number (17253000).

Almost surely, 2^221047057 is an apocalyptic number.

It is an amenable number.

221047057 is a deficient number, since it is larger than the sum of its proper divisors (55000943).

221047057 is a wasteful number, since it uses less digits than its factorization.

221047057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4776.

The product of its (nonzero) digits is 3920, while the sum is 28.

The square root of 221047057 is about 14867.6513612608. The cubic root of 221047057 is about 604.6372681649.

Adding to 221047057 its reverse (750740122), we get a palindrome (971787179).

It can be divided in two parts, 22104 and 7057, that added together give a triangular number (29161 = T₂₄₁).

The spelling of 221047057 in words is "two hundred twenty-one million, forty-seven thousand, fifty-seven".