1440130021 has 16 divisors (see below), whose sum is σ = 1626902208. Its totient is φ = 1273781520.

The previous prime is 1440130009. The next prime is 1440130031. The reversal of 1440130021 is 1200310441.

It is not a de Polignac number, because 1440130021 - 2⁵ = 1440129989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1440129977 and 1440130004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1440130031) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34626 + ... + 63868.

It is an arithmetic number, because the mean of its divisors is an integer number (101681388).

Almost surely, 2^1440130021 is an apocalyptic number.

1440130021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1440130021 is a deficient number, since it is larger than the sum of its proper divisors (186772187).

1440130021 is an equidigital number, since it uses as much as digits as its factorization.

1440130021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29313 (or 29291 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 1440130021 is about 37949.0450604491. The cubic root of 1440130021 is about 1129.2772209803.

Adding to 1440130021 its reverse (1200310441), we get a palindrome (2640440462).

The spelling of 1440130021 in words is "one billion, four hundred forty million, one hundred thirty thousand, twenty-one".