20121002022121 has 48 divisors (see below), whose sum is σ = 28168716860928. Its totient is φ = 14119657171200.

The previous prime is 20121002022091. The next prime is 20121002022133. The reversal of 20121002022121 is 12122020012102.

It is a happy number.

It is not a de Polignac number, because 20121002022121 - 2⁷ = 20121002021993 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20121002022095 and 20121002022104.

It is not an unprimeable number, because it can be changed into a prime (20121002022221) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 34731705 + ... + 35306278.

It is an arithmetic number, because the mean of its divisors is an integer number (586848267936).

Almost surely, 2^{20121002022121} is an apocalyptic number.

It is an amenable number.

20121002022121 is a deficient number, since it is larger than the sum of its proper divisors (8047714838807).

20121002022121 is a wasteful number, since it uses less digits than its factorization.

20121002022121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70038062 (or 70038055 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 20121002022121 its reverse (12122020012102), we get a palindrome (32243022034223).

The spelling of 20121002022121 in words is "twenty trillion, one hundred twenty-one billion, two million, twenty-two thousand, one hundred twenty-one".