2121012112021 has 32 divisors (see below), whose sum is σ = 2397252744576. Its totient is φ = 1860249120000.

The previous prime is 2121012112007. The next prime is 2121012112033. The reversal of 2121012112021 is 1202112101212.

It is a cyclic number.

It is not a de Polignac number, because 2121012112021 - 2²⁷ = 2120877894293 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2121012111986 and 2121012112004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121012112421) 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 31 ways as a sum of consecutive naturals, for example, 7105251 + ... + 7397743.

It is an arithmetic number, because the mean of its divisors is an integer number (74914148268).

Almost surely, 2^{2121012112021} is an apocalyptic number.

It is an amenable number.

2121012112021 is a deficient number, since it is larger than the sum of its proper divisors (276240632555).

2121012112021 is a wasteful number, since it uses less digits than its factorization.

2121012112021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 292773.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 2121012112021 its reverse (1202112101212), we get a palindrome (3323124213233).

The spelling of 2121012112021 in words is "two trillion, one hundred twenty-one billion, twelve million, one hundred twelve thousand, twenty-one".