20112311321221 has 16 divisors (see below), whose sum is σ = 23328794119680. Its totient is φ = 16981657426800.

The previous prime is 20112311321213. The next prime is 20112311321237. The reversal of 20112311321221 is 12212311321102.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 20112311321221 - 2³ = 20112311321213 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20112311321192 and 20112311321201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20112311327221) 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, 82355946 + ... + 82599796.

It is an arithmetic number, because the mean of its divisors is an integer number (1458049632480).

Almost surely, 2^{20112311321221} is an apocalyptic number.

It is an amenable number.

20112311321221 is a deficient number, since it is larger than the sum of its proper divisors (3216482798459).

20112311321221 is a wasteful number, since it uses less digits than its factorization.

20112311321221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 419784.

The product of its (nonzero) digits is 288, while the sum is 22.

Adding to 20112311321221 its reverse (12212311321102), we get a palindrome (32324622642323).

The spelling of 20112311321221 in words is "twenty trillion, one hundred twelve billion, three hundred eleven million, three hundred twenty-one thousand, two hundred twenty-one".