20112102212121 has 32 divisors (see below), whose sum is σ = 30698947422720. Its totient is φ = 13006659117312.

The previous prime is 20112102212021. The next prime is 20112102212123. The reversal of 20112102212121 is 12121220121102.

20112102212121 is a `hidden beast` number, since 20 + 1 + 1 + 210 + 221 + 212 + 1 = 666.

It is not a de Polignac number, because 20112102212121 - 2¹³ = 20112102203929 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20112102212094 and 20112102212103.

It is not an unprimeable number, because it can be changed into a prime (20112102212123) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 69983950 + ... + 70270743.

It is an arithmetic number, because the mean of its divisors is an integer number (959342106960).

Almost surely, 2^{20112102212121} is an apocalyptic number.

It is an amenable number.

20112102212121 is a deficient number, since it is larger than the sum of its proper divisors (10586845210599).

20112102212121 is a wasteful number, since it uses less digits than its factorization.

20112102212121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140254862 (or 140254856 counting only the distinct ones).

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

Adding to 20112102212121 its reverse (12121220121102), we get a palindrome (32233322333223).

The spelling of 20112102212121 in words is "twenty trillion, one hundred twelve billion, one hundred two million, two hundred twelve thousand, one hundred twenty-one".