2111210000021 has 4 divisors (see below), whose sum is σ = 2111258820192. Its totient is φ = 2111161179852.

The previous prime is 2111209999957. The next prime is 2111210000113. The reversal of 2111210000021 is 1200000121112.

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 2111210000021 - 2⁶ = 2111209999957 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2111209999957 and 2111210000011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2111210000521) 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 3 ways as a sum of consecutive naturals, for example, 24345161 + ... + 24431726.

It is an arithmetic number, because the mean of its divisors is an integer number (527814705048).

Almost surely, 2^{2111210000021} is an apocalyptic number.

It is an amenable number.

2111210000021 is a deficient number, since it is larger than the sum of its proper divisors (48820171).

2111210000021 is an equidigital number, since it uses as much as digits as its factorization.

2111210000021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48820170.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 2111210000021 its reverse (1200000121112), we get a palindrome (3311210121133).

The spelling of 2111210000021 in words is "two trillion, one hundred eleven billion, two hundred ten million, twenty-one", and thus it is an aban number.