2121111230021 has 32 divisors (see below), whose sum is σ = 2561487667200. Its totient is φ = 1715811431040.

The previous prime is 2121111230009. The next prime is 2121111230027. The reversal of 2121111230021 is 1200321111212.

It is a happy number.

It is not a de Polignac number, because 2121111230021 - 2¹⁰ = 2121111228997 is a prime.

It is a super-2 number, since 2×2121111230021² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121111230027) 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, 229577720 + ... + 229586958.

It is an arithmetic number, because the mean of its divisors is an integer number (80046489600).

Almost surely, 2^{2121111230021} is an apocalyptic number.

It is an amenable number.

2121111230021 is a deficient number, since it is larger than the sum of its proper divisors (440376437179).

2121111230021 is a wasteful number, since it uses less digits than its factorization.

2121111230021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15689.

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 2121111230021 its reverse (1200321111212), we get a palindrome (3321432341233).

The spelling of 2121111230021 in words is "two trillion, one hundred twenty-one billion, one hundred eleven million, two hundred thirty thousand, twenty-one".