2111220221021 has 4 divisors (see below), whose sum is σ = 2130951251232. Its totient is φ = 2091489190812.

The previous prime is 2111220221009. The next prime is 2111220221023. The reversal of 2111220221021 is 1201220221112.

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 2111220221021 - 2⁶ = 2111220220957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2111220221023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9865514945 + ... + 9865515158.

It is an arithmetic number, because the mean of its divisors is an integer number (532737812808).

Almost surely, 2^{2111220221021} is an apocalyptic number.

It is an amenable number.

2111220221021 is a deficient number, since it is larger than the sum of its proper divisors (19731030211).

2111220221021 is a wasteful number, since it uses less digits than its factorization.

2111220221021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19731030210.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 2111220221021 its reverse (1201220221112), we get a palindrome (3312440442133).

Subtracting from 2111220221021 its reverse (1201220221112), we obtain a palindrome (909999999909).

The spelling of 2111220221021 in words is "two trillion, one hundred eleven billion, two hundred twenty million, two hundred twenty-one thousand, twenty-one".