2111121020021 has 16 divisors (see below), whose sum is σ = 2407845497904. Its totient is φ = 1833643229184.

The previous prime is 2111121019991. The next prime is 2111121020083. The reversal of 2111121020021 is 1200201211112.

It can be written as a sum of positive squares in 8 ways, for example, as 178159123921 + 1932961896100 = 422089^2 + 1390310^2 .

It is not a de Polignac number, because 2111121020021 - 2¹⁰ = 2111121018997 is a prime.

It is a super-2 number, since 2×2111121020021² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2111121019978 and 2111121020005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2111121620021) 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, 280700 + ... + 2073893.

It is an arithmetic number, because the mean of its divisors is an integer number (150490343619).

Almost surely, 2^{2111121020021} is an apocalyptic number.

It is an amenable number.

2111121020021 is a deficient number, since it is larger than the sum of its proper divisors (296724477883).

2111121020021 is a wasteful number, since it uses less digits than its factorization.

2111121020021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2358680.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 2111121020021 its reverse (1200201211112), we get a palindrome (3311322231133).

The spelling of 2111121020021 in words is "two trillion, one hundred eleven billion, one hundred twenty-one million, twenty thousand, twenty-one".