2111220021 has 8 divisors (see below), whose sum is σ = 2980545984. Its totient is φ = 1324687040.

The previous prime is 2111219983. The next prime is 2111220029. The reversal of 2111220021 is 1200221112.

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 2111220021 - 2¹⁰ = 2111218997 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2111219979 and 2111220006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2111220029) 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 7 ways as a sum of consecutive naturals, for example, 20698185 + ... + 20698286.

It is an arithmetic number, because the mean of its divisors is an integer number (372568248).

Almost surely, 2^2111220021 is an apocalyptic number.

It is an amenable number.

2111220021 is a deficient number, since it is larger than the sum of its proper divisors (869325963).

2111220021 is a wasteful number, since it uses less digits than its factorization.

2111220021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41396491.

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 2111220021 is about 45948.0143314159. The cubic root of 2111220021 is about 1282.8557700373.

Adding to 2111220021 its reverse (1200221112), we get a palindrome (3311441133).

The spelling of 2111220021 in words is "two billion, one hundred eleven million, two hundred twenty thousand, twenty-one".