20121011222121 has 12 divisors (see below), whose sum is σ = 29067527885760. Its totient is φ = 13412232861720.

The previous prime is 20121011222101. The next prime is 20121011222233. The reversal of 20121011222121 is 12122211012102.

20121011222121 is a `hidden beast` number, since 201 + 210 + 1 + 12 + 221 + 21 = 666.

It is not a de Polignac number, because 20121011222121 - 2²³ = 20121002833513 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20121011222094 and 20121011222103.

It is not an unprimeable number, because it can be changed into a prime (20121011222101) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 147813165 + ... + 147949226.

It is an arithmetic number, because the mean of its divisors is an integer number (2422293990480).

Almost surely, 2^{20121011222121} is an apocalyptic number.

It is an amenable number.

20121011222121 is a deficient number, since it is larger than the sum of its proper divisors (8946516663639).

20121011222121 is a wasteful number, since it uses less digits than its factorization.

20121011222121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 295769956 (or 295769953 counting only the distinct ones).

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

Adding to 20121011222121 its reverse (12122211012102), we get a palindrome (32243222234223).

The spelling of 20121011222121 in words is "twenty trillion, one hundred twenty-one billion, eleven million, two hundred twenty-two thousand, one hundred twenty-one".