20120132312221 has 4 divisors (see below), whose sum is σ = 20120153614912. Its totient is φ = 20120111009532.

The previous prime is 20120132312183. The next prime is 20120132312243. The reversal of 20120132312221 is 12221323102102.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20120132312221 - 2³³ = 20111542377629 is a prime.

It is a super-2 number, since 2×20120132312221² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20120132312192 and 20120132312201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20120132312321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9165525 + ... + 11146618.

It is an arithmetic number, because the mean of its divisors is an integer number (5030038403728).

Almost surely, 2^{20120132312221} is an apocalyptic number.

It is an amenable number.

20120132312221 is a deficient number, since it is larger than the sum of its proper divisors (21302691).

20120132312221 is an equidigital number, since it uses as much as digits as its factorization.

20120132312221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21302690.

The product of its (nonzero) digits is 576, while the sum is 22.

Adding to 20120132312221 its reverse (12221323102102), we get a palindrome (32341455414323).

It can be divided in two parts, 2012013 and 2312221, that added together give a palindrome (4324234).

The spelling of 20120132312221 in words is "twenty trillion, one hundred twenty billion, one hundred thirty-two million, three hundred twelve thousand, two hundred twenty-one".