220321631 has 2 divisors, whose sum is σ = 220321632. Its totient is φ = 220321630.

The previous prime is 220321627. The next prime is 220321679. The reversal of 220321631 is 136123022.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 220321631 - 2² = 220321627 is a prime.

It is a super-2 number, since 2×220321631² = 97083242173000322, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (220324631) 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 as a sum of consecutive naturals, namely, 110160815 + 110160816.

It is an arithmetic number, because the mean of its divisors is an integer number (110160816).

Almost surely, 2^220321631 is an apocalyptic number.

220321631 is a deficient number, since it is larger than the sum of its proper divisors (1).

220321631 is an equidigital number, since it uses as much as digits as its factorization.

220321631 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 220321631 is about 14843.2351931781. The cubic root of 220321631 is about 603.9751161115.

Adding to 220321631 its reverse (136123022), we get a palindrome (356444653).

The spelling of 220321631 in words is "two hundred twenty million, three hundred twenty-one thousand, six hundred thirty-one".