20012122121 has 8 divisors (see below), whose sum is σ = 20189556288. Its totient is φ = 19835062000.

The previous prime is 20012122111. The next prime is 20012122129. The reversal of 20012122121 is 12122121002.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20012122121 - 2¹⁰ = 20012121097 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20012122096 and 20012122105.

It is not an unprimeable number, because it can be changed into a prime (20012122129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14516 + ... + 200586.

It is an arithmetic number, because the mean of its divisors is an integer number (2523694536).

Almost surely, 2^20012122121 is an apocalyptic number.

It is an amenable number.

20012122121 is a deficient number, since it is larger than the sum of its proper divisors (177434167).

20012122121 is a wasteful number, since it uses less digits than its factorization.

20012122121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 187023.

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

Adding to 20012122121 its reverse (12122121002), we get a palindrome (32134243123).

The spelling of 20012122121 in words is "twenty billion, twelve million, one hundred twenty-two thousand, one hundred twenty-one".