20013112221 has 8 divisors (see below), whose sum is σ = 26684848800. Its totient is φ = 13341725232.

The previous prime is 20013112201. The next prime is 20013112237. The reversal of 20013112221 is 12221131002.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20013112221 - 2⁶ = 20013112157 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20013112221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20013112201) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 109651 + ... + 228143.

It is an arithmetic number, because the mean of its divisors is an integer number (3335606100).

Almost surely, 2^20013112221 is an apocalyptic number.

It is an amenable number.

20013112221 is a deficient number, since it is larger than the sum of its proper divisors (6671736579).

20013112221 is a wasteful number, since it uses less digits than its factorization.

20013112221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174795.

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 20013112221 its reverse (12221131002), we get a palindrome (32234243223).

The spelling of 20013112221 in words is "twenty billion, thirteen million, one hundred twelve thousand, two hundred twenty-one".