220121533 has 4 divisors (see below), whose sum is σ = 220411548. Its totient is φ = 219831520.

The previous prime is 220121519. The next prime is 220121549. The reversal of 220121533 is 335121022.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 40615129 + 179506404 = 6373^2 + 13398^2 .

It is a cyclic number.

It is not a de Polignac number, because 220121533 - 2⁹ = 220121021 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 220121533.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220121563) 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 3 ways as a sum of consecutive naturals, for example, 143866 + ... + 145387.

It is an arithmetic number, because the mean of its divisors is an integer number (55102887).

Almost surely, 2^220121533 is an apocalyptic number.

It is an amenable number.

220121533 is a deficient number, since it is larger than the sum of its proper divisors (290015).

220121533 is an equidigital number, since it uses as much as digits as its factorization.

220121533 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 290014.

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 220121533 is about 14836.4932851399. The cubic root of 220121533 is about 603.7922155982.

Adding to 220121533 its reverse (335121022), we get a palindrome (555242555).

The spelling of 220121533 in words is "two hundred twenty million, one hundred twenty-one thousand, five hundred thirty-three".