2031440021 has 8 divisors (see below), whose sum is σ = 2228982840. Its totient is φ = 1839794112.

The previous prime is 2031439979. The next prime is 2031440027. The reversal of 2031440021 is 1200441302.

It can be written as a sum of positive squares in 4 ways, for example, as 25654225 + 2005785796 = 5065^2 + 44786^2 .

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

It is not a de Polignac number, because 2031440021 - 2²⁶ = 1964331157 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2031440027) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1473506 + ... + 1474883.

It is an arithmetic number, because the mean of its divisors is an integer number (278622855).

Almost surely, 2^2031440021 is an apocalyptic number.

It is an amenable number.

2031440021 is a deficient number, since it is larger than the sum of its proper divisors (197542819).

2031440021 is a wasteful number, since it uses less digits than its factorization.

2031440021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2948455.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 2031440021 is about 45071.4989877195. The cubic root of 2031440021 is about 1266.4887451465.

Adding to 2031440021 its reverse (1200441302), we get a palindrome (3231881323).

The spelling of 2031440021 in words is "two billion, thirty-one million, four hundred forty thousand, twenty-one".