20111222012121 has 32 divisors (see below), whose sum is σ = 31673049628800. Its totient is φ = 12576063758400.

The previous prime is 20111222012111. The next prime is 20111222012171. The reversal of 20111222012121 is 12121022211102.

20111222012121 is a `hidden beast` number, since 201 + 112 + 220 + 12 + 121 = 666.

It is not a de Polignac number, because 20111222012121 - 2⁴² = 15713175501017 is a prime.

It is a super-2 number, since 2×20111222012121² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20111222012094 and 20111222012103.

It is not an unprimeable number, because it can be changed into a prime (20111222012111) 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, 194023246 + ... + 194126871.

It is an arithmetic number, because the mean of its divisors is an integer number (989782800900).

Almost surely, 2^{20111222012121} is an apocalyptic number.

It is an amenable number.

20111222012121 is a deficient number, since it is larger than the sum of its proper divisors (11561827616679).

20111222012121 is a wasteful number, since it uses less digits than its factorization.

20111222012121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 388150246 (or 388150240 counting only the distinct ones).

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

Adding to 20111222012121 its reverse (12121022211102), we get a palindrome (32232244223223).

The spelling of 20111222012121 in words is "twenty trillion, one hundred eleven billion, two hundred twenty-two million, twelve thousand, one hundred twenty-one".