220221031 has 2 divisors, whose sum is σ = 220221032. Its totient is φ = 220221030.

The previous prime is 220221019. The next prime is 220221047. The reversal of 220221031 is 130122022.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 220221031 - 2⁵ = 220220999 is a prime.

It is a super-2 number, since 2×220221031² = 96994604989405922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (220221091) 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 as a sum of consecutive naturals, namely, 110110515 + 110110516.

It is an arithmetic number, because the mean of its divisors is an integer number (110110516).

Almost surely, 2^220221031 is an apocalyptic number.

220221031 is a deficient number, since it is larger than the sum of its proper divisors (1).

220221031 is an equidigital number, since it uses as much as digits as its factorization.

220221031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 220221031 is about 14839.8460571530. The cubic root of 220221031 is about 603.8831760593.

Adding to 220221031 its reverse (130122022), we get a palindrome (350343053).

Subtracting from 220221031 its reverse (130122022), we obtain a palindrome (90099009).

The spelling of 220221031 in words is "two hundred twenty million, two hundred twenty-one thousand, thirty-one".