2101221243 has 48 divisors (see below), whose sum is σ = 3442787712. Its totient is φ = 1270080000.

The previous prime is 2101221193. The next prime is 2101221247. The reversal of 2101221243 is 3421221012.

It is a happy number.

It is not a de Polignac number, because 2101221243 - 2¹² = 2101217147 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2101221247) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1311643 + ... + 1313243.

It is an arithmetic number, because the mean of its divisors is an integer number (71724744).

Almost surely, 2^2101221243 is an apocalyptic number.

2101221243 is a deficient number, since it is larger than the sum of its proper divisors (1341566469).

2101221243 is a wasteful number, since it uses less digits than its factorization.

2101221243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2118 (or 2106 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 2101221243 is about 45839.0798664197. The cubic root of 2101221243 is about 1280.8273547145.

Adding to 2101221243 its reverse (3421221012), we get a palindrome (5522442255).

The spelling of 2101221243 in words is "two billion, one hundred one million, two hundred twenty-one thousand, two hundred forty-three".