20210011211121 has 32 divisors (see below), whose sum is σ = 27112794551040. Its totient is φ = 13390533273600.

The previous prime is 20210011211111. The next prime is 20210011211297. The reversal of 20210011211121 is 12111211001202.

It is a happy number.

It is not a de Polignac number, because 20210011211121 - 2⁷ = 20210011210993 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20210011211121.

It is not an unprimeable number, because it can be changed into a prime (20210011211111) 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, 870771765 + ... + 870794973.

It is an arithmetic number, because the mean of its divisors is an integer number (847274829720).

Almost surely, 2^{20210011211121} is an apocalyptic number.

It is an amenable number.

20210011211121 is a deficient number, since it is larger than the sum of its proper divisors (6902783339919).

20210011211121 is a wasteful number, since it uses less digits than its factorization.

20210011211121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25817.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 20210011211121 its reverse (12111211001202), we get a palindrome (32321222212323).

The spelling of 20210011211121 in words is "twenty trillion, two hundred ten billion, eleven million, two hundred eleven thousand, one hundred twenty-one".