20112122101221 has 24 divisors (see below), whose sum is σ = 29142149333024. Its totient is φ = 13365949877280.

The previous prime is 20112122101187. The next prime is 20112122101297. The reversal of 20112122101221 is 12210122121102.

20112122101221 is a `hidden beast` number, since 20 + 1 + 1 + 212 + 210 + 1 + 221 = 666.

It is not a de Polignac number, because 20112122101221 - 2¹³ = 20112122093029 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20112122101194 and 20112122101203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20112122105221) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 24370470 + ... + 25182216.

Almost surely, 2^{20112122101221} is an apocalyptic number.

It is an amenable number.

20112122101221 is a deficient number, since it is larger than the sum of its proper divisors (9030027231803).

20112122101221 is a wasteful number, since it uses less digits than its factorization.

20112122101221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 820401 (or 820398 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 20112122101221 its reverse (12210122121102), we get a palindrome (32322244222323).

The spelling of 20112122101221 in words is "twenty trillion, one hundred twelve billion, one hundred twenty-two million, one hundred one thousand, two hundred twenty-one".