221022021 has 64 divisors (see below), whose sum is σ = 351267840. Its totient is φ = 122304000.

The previous prime is 221022017. The next prime is 221022073. The reversal of 221022021 is 120220122.

It is not a de Polignac number, because 221022021 - 2² = 221022017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221021988 and 221022006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221022091) 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 63 ways as a sum of consecutive naturals, for example, 1687126 + ... + 1687256.

It is an arithmetic number, because the mean of its divisors is an integer number (5488560).

Almost surely, 2^221022021 is an apocalyptic number.

It is an amenable number.

221022021 is a deficient number, since it is larger than the sum of its proper divisors (130245819).

221022021 is a wasteful number, since it uses less digits than its factorization.

221022021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 258.

The product of its (nonzero) digits is 32, while the sum is 12.

The square root of 221022021 is about 14866.8093752493. The cubic root of 221022021 is about 604.6144400390.

Adding to 221022021 its reverse (120220122), we get a palindrome (341242143).

The spelling of 221022021 in words is "two hundred twenty-one million, twenty-two thousand, twenty-one".