2101244240 has 20 divisors (see below), whose sum is σ = 4885393044. Its totient is φ = 840497664.

The previous prime is 2101244239. The next prime is 2101244261. The reversal of 2101244240 is 424421012.

It can be written as a sum of positive squares in 2 ways, for example, as 1536326416 + 564917824 = 39196^2 + 23768^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a super-2 number, since 2×2101244240² = 8830454712266355200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 13132697 + ... + 13132856.

Almost surely, 2^2101244240 is an apocalyptic number.

2101244240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2101244240 is an abundant number, since it is smaller than the sum of its proper divisors (2784148804).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2101244240 is a wasteful number, since it uses less digits than its factorization.

2101244240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26265566 (or 26265560 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 20.

The square root of 2101244240 is about 45839.3307106463. The cubic root of 2101244240 is about 1280.8320274066.

Adding to 2101244240 its reverse (424421012), we get a palindrome (2525665252).

The spelling of 2101244240 in words is "two billion, one hundred one million, two hundred forty-four thousand, two hundred forty".