20102001121021 has 8 divisors (see below), whose sum is σ = 20795356308600. Its totient is φ = 19408658115840.

The previous prime is 20102001121003. The next prime is 20102001121051. The reversal of 20102001121021 is 12012110020102.

It can be written as a sum of positive squares in 4 ways, for example, as 5067878928025 + 15034122192996 = 2251195^2 + 3877386^2 .

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

It is not a de Polignac number, because 20102001121021 - 2¹⁷ = 20102000989949 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20102001120992 and 20102001121010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20102001121001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 376681 + ... + 6351841.

It is an arithmetic number, because the mean of its divisors is an integer number (2599419538575).

Almost surely, 2^{20102001121021} is an apocalyptic number.

It is an amenable number.

20102001121021 is a deficient number, since it is larger than the sum of its proper divisors (693355187579).

20102001121021 is a wasteful number, since it uses less digits than its factorization.

20102001121021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6091199.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 20102001121021 its reverse (12012110020102), we get a palindrome (32114111141123).

The spelling of 20102001121021 in words is "twenty trillion, one hundred two billion, one million, one hundred twenty-one thousand, twenty-one".