2101221123 has 8 divisors (see below), whose sum is σ = 2840006928. Its totient is φ = 1381624704.

The previous prime is 2101221107. The next prime is 2101221127. The reversal of 2101221123 is 3211221012.

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

It is not a de Polignac number, because 2101221123 - 2⁴ = 2101221107 is a prime.

It is a super-2 number, since 2×2101221123² = 8830260415482762258, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2101221127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4797090 + ... + 4797527.

It is an arithmetic number, because the mean of its divisors is an integer number (355000866).

Almost surely, 2^2101221123 is an apocalyptic number.

2101221123 is a deficient number, since it is larger than the sum of its proper divisors (738785805).

2101221123 is an equidigital number, since it uses as much as digits as its factorization.

2101221123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9594693.

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 2101221123 is about 45839.0785574928. The cubic root of 2101221123 is about 1280.8273303320.

Adding to 2101221123 its reverse (3211221012), we get a palindrome (5312442135).

The spelling of 2101221123 in words is "two billion, one hundred one million, two hundred twenty-one thousand, one hundred twenty-three".