21020020001121 has 32 divisors (see below), whose sum is σ = 28346995365120. Its totient is φ = 13854201984000.

The previous prime is 21020020001117. The next prime is 21020020001143. The reversal of 21020020001121 is 12110002002012.

It is not a de Polignac number, because 21020020001121 - 2² = 21020020001117 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21020020001097 and 21020020001106.

It is not an unprimeable number, because it can be changed into a prime (21020020001191) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 105426301 + ... + 105625493.

It is an arithmetic number, because the mean of its divisors is an integer number (885843605160).

Almost surely, 2^{21020020001121} is an apocalyptic number.

It is an amenable number.

21020020001121 is a deficient number, since it is larger than the sum of its proper divisors (7326975363999).

21020020001121 is a wasteful number, since it uses less digits than its factorization.

21020020001121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 200457.

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

Adding to 21020020001121 its reverse (12110002002012), we get a palindrome (33130022003133).

The spelling of 21020020001121 in words is "twenty-one trillion, twenty billion, twenty million, one thousand, one hundred twenty-one".