2111121021 has 8 divisors (see below), whose sum is σ = 2841135264. Its totient is φ = 1394260400.

The previous prime is 2111121017. The next prime is 2111121071. The reversal of 2111121021 is 1201211112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2111121021 - 2² = 2111121017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2111120988 and 2111121006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2111121071) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3288030 + ... + 3288671.

It is an arithmetic number, because the mean of its divisors is an integer number (355141908).

Almost surely, 2^2111121021 is an apocalyptic number.

It is an amenable number.

2111121021 is a deficient number, since it is larger than the sum of its proper divisors (730014243).

2111121021 is a wasteful number, since it uses less digits than its factorization.

2111121021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6576811.

The product of its (nonzero) digits is 8, while the sum is 12.

The square root of 2111121021 is about 45946.9370143430. The cubic root of 2111121021 is about 1282.8357176971.

Adding to 2111121021 its reverse (1201211112), we get a palindrome (3312332133).

Subtracting from 2111121021 its reverse (1201211112), we obtain a palindrome (909909909).

The spelling of 2111121021 in words is "two billion, one hundred eleven million, one hundred twenty-one thousand, twenty-one".