20132221 has 4 divisors (see below), whose sum is σ = 20176732. Its totient is φ = 20087712.

The previous prime is 20132219. The next prime is 20132243. The reversal of 20132221 is 12223102.

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 16112196 + 4020025 = 4014^2 + 2005^2 .

It is a cyclic number.

It is not a de Polignac number, because 20132221 - 2¹ = 20132219 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20132201) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21570 + ... + 22483.

It is an arithmetic number, because the mean of its divisors is an integer number (5044183).

Almost surely, 2^20132221 is an apocalyptic number.

It is an amenable number.

20132221 is a deficient number, since it is larger than the sum of its proper divisors (44511).

20132221 is an equidigital number, since it uses as much as digits as its factorization.

20132221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44510.

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

The square root of 20132221 is about 4486.8943602452. The cubic root of 20132221 is about 272.0386199848.

Adding to 20132221 its reverse (12223102), we get a palindrome (32355323).

The spelling of 20132221 in words is "twenty million, one hundred thirty-two thousand, two hundred twenty-one".