221020432 has 30 divisors (see below), whose sum is σ = 447672302. Its totient is φ = 105701376.

The previous prime is 221020403. The next prime is 221020447. The reversal of 221020432 is 234020122.

It can be written as a sum of positive squares in only one way, i.e., 198133776 + 22886656 = 14076^2 + 4784^2 .

It is a super-2 number, since 2×221020432² = 97700062722933248, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4593 + ... + 21520.

Almost surely, 2^221020432 is an apocalyptic number.

It is an amenable number.

221020432 is an abundant number, since it is smaller than the sum of its proper divisors (226651870).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221020432 is a wasteful number, since it uses less digits than its factorization.

221020432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26167 (or 26138 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 221020432 is about 14866.7559339622. The cubic root of 221020432 is about 604.6129911115.

Adding to 221020432 its reverse (234020122), we get a palindrome (455040554).

The spelling of 221020432 in words is "two hundred twenty-one million, twenty thousand, four hundred thirty-two".