21112020011121 has 64 divisors (see below), whose sum is σ = 32069744738304. Its totient is φ = 12255495436800.

The previous prime is 21112020011111. The next prime is 21112020011219. The reversal of 21112020011121 is 12111002021112.

It is a happy number.

It is not a de Polignac number, because 21112020011121 - 2³⁰ = 21110946269297 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21112020011121.

It is not an unprimeable number, because it can be changed into a prime (21112020011101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 905656056 + ... + 905679366.

It is an arithmetic number, because the mean of its divisors is an integer number (501089761536).

Almost surely, 2^{21112020011121} is an apocalyptic number.

It is an amenable number.

21112020011121 is a deficient number, since it is larger than the sum of its proper divisors (10957724727183).

21112020011121 is a wasteful number, since it uses less digits than its factorization.

21112020011121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37254.

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

Adding to 21112020011121 its reverse (12111002021112), we get a palindrome (33223022032233).

The spelling of 21112020011121 in words is "twenty-one trillion, one hundred twelve billion, twenty million, eleven thousand, one hundred twenty-one".