2120111212021 has 4 divisors (see below), whose sum is σ = 2312848594944. Its totient is φ = 1927373829100.

The previous prime is 2120111211997. The next prime is 2120111212069. The reversal of 2120111212021 is 1202121110212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2120111212021 - 2¹³ = 2120111203829 is a prime.

It is a super-2 number, since 2×2120111212021² (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 = 2120111211986 and 2120111212004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2120111212321) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 96368691445 + ... + 96368691466.

It is an arithmetic number, because the mean of its divisors is an integer number (578212148736).

Almost surely, 2^{2120111212021} is an apocalyptic number.

It is an amenable number.

2120111212021 is a deficient number, since it is larger than the sum of its proper divisors (192737382923).

2120111212021 is a wasteful number, since it uses less digits than its factorization.

2120111212021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192737382922.

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

Adding to 2120111212021 its reverse (1202121110212), we get a palindrome (3322232322233).

The spelling of 2120111212021 in words is "two trillion, one hundred twenty billion, one hundred eleven million, two hundred twelve thousand, twenty-one".