20113230311221 has 16 divisors (see below), whose sum is σ = 20305848633840. Its totient is φ = 19921545745920.

The previous prime is 20113230311201. The next prime is 20113230311227. The reversal of 20113230311221 is 12211303231102.

It can be written as a sum of positive squares in 8 ways, for example, as 5312513302321 + 14800717008900 = 2304889^2 + 3847170^2 .

It is a cyclic number.

It is not a de Polignac number, because 20113230311221 - 2¹³ = 20113230303029 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20113230311192 and 20113230311201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20113230311227) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 538675665 + ... + 538713001.

It is an arithmetic number, because the mean of its divisors is an integer number (1269115539615).

Almost surely, 2^{20113230311221} is an apocalyptic number.

It is an amenable number.

20113230311221 is a deficient number, since it is larger than the sum of its proper divisors (192618322619).

20113230311221 is a wasteful number, since it uses less digits than its factorization.

20113230311221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49704.

The product of its (nonzero) digits is 432, while the sum is 22.

Adding to 20113230311221 its reverse (12211303231102), we get a palindrome (32324533542323).

The spelling of 20113230311221 in words is "twenty trillion, one hundred thirteen billion, two hundred thirty million, three hundred eleven thousand, two hundred twenty-one".