221020005 has 32 divisors (see below), whose sum is σ = 358944768. Its totient is φ = 116121600.

The previous prime is 221020003. The next prime is 221020039. The reversal of 221020005 is 500020122.

It is not a de Polignac number, because 221020005 - 2¹ = 221020003 is a prime.

It is a super-2 number, since 2×221020005² = 97699685220400050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221020001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 344485 + ... + 345125.

It is an arithmetic number, because the mean of its divisors is an integer number (11217024).

Almost surely, 2^221020005 is an apocalyptic number.

It is an amenable number.

221020005 is a deficient number, since it is larger than the sum of its proper divisors (137924763).

221020005 is a wasteful number, since it uses less digits than its factorization.

221020005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 957.

The product of its (nonzero) digits is 40, while the sum is 12.

The square root of 221020005 is about 14866.7415730549. The cubic root of 221020005 is about 604.6126017509.

Adding to 221020005 its reverse (500020122), we get a palindrome (721040127).

The spelling of 221020005 in words is "two hundred twenty-one million, twenty thousand, five".