20011022121 has 8 divisors (see below), whose sum is σ = 26721730624. Its totient is φ = 13320497520.

The previous prime is 20011022117. The next prime is 20011022149. The reversal of 20011022121 is 12122011002.

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

It is not a de Polignac number, because 20011022121 - 2² = 20011022117 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20011022097 and 20011022106.

It is not an unprimeable number, because it can be changed into a prime (20011022111) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5043661 + ... + 5047626.

It is an arithmetic number, because the mean of its divisors is an integer number (3340216328).

Almost surely, 2^20011022121 is an apocalyptic number.

It is an amenable number.

20011022121 is a deficient number, since it is larger than the sum of its proper divisors (6710708503).

20011022121 is a wasteful number, since it uses less digits than its factorization.

20011022121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10091951.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 20011022121 its reverse (12122011002), we get a palindrome (32133033123).

The spelling of 20011022121 in words is "twenty billion, eleven million, twenty-two thousand, one hundred twenty-one".