20011022012121 has 16 divisors (see below), whose sum is σ = 31115291760000. Its totient is φ = 11434869720624.

The previous prime is 20011022012117. The next prime is 20011022012123. The reversal of 20011022012121 is 12121022011002.

It is not a de Polignac number, because 20011022012121 - 2² = 20011022012117 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20011022012121.

It is not an unprimeable number, because it can be changed into a prime (20011022012123) 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, 9723527646 + ... + 9723529703.

It is an arithmetic number, because the mean of its divisors is an integer number (1944705735000).

Almost surely, 2^{20011022012121} is an apocalyptic number.

20011022012121 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20011022012121 is a deficient number, since it is larger than the sum of its proper divisors (11104269747879).

20011022012121 is an equidigital number, since it uses as much as digits as its factorization.

20011022012121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19447057373 (or 19447057359 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 20011022012121 its reverse (12121022011002), we get a palindrome (32132044023123).

The spelling of 20011022012121 in words is "twenty trillion, eleven billion, twenty-two million, twelve thousand, one hundred twenty-one".