20121022121 has 16 divisors (see below), whose sum is σ = 21616900800. Its totient is φ = 18692106048.

The previous prime is 20121022111. The next prime is 20121022123. The reversal of 20121022121 is 12122012102.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20121022121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20121022096 and 20121022105.

It is not an unprimeable number, because it can be changed into a prime (20121022123) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36866 + ... + 203963.

It is an arithmetic number, because the mean of its divisors is an integer number (1351056300).

Almost surely, 2^20121022121 is an apocalyptic number.

It is an amenable number.

20121022121 is a deficient number, since it is larger than the sum of its proper divisors (1495878679).

20121022121 is a wasteful number, since it uses less digits than its factorization.

20121022121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 240968.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 20121022121 its reverse (12122012102), we get a palindrome (32243034223).

The spelling of 20121022121 in words is "twenty billion, one hundred twenty-one million, twenty-two thousand, one hundred twenty-one".