2140028021 has 4 divisors (see below), whose sum is σ = 2154200544. Its totient is φ = 2125855500.

The previous prime is 2140027993. The next prime is 2140028029. The reversal of 2140028021 is 1208200412.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2140028021 - 2⁶ = 2140027957 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2140027984 and 2140028002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2140028029) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7086035 + ... + 7086336.

It is an arithmetic number, because the mean of its divisors is an integer number (538550136).

Almost surely, 2^2140028021 is an apocalyptic number.

It is an amenable number.

2140028021 is a deficient number, since it is larger than the sum of its proper divisors (14172523).

2140028021 is a wasteful number, since it uses less digits than its factorization.

2140028021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14172522.

The product of its (nonzero) digits is 256, while the sum is 20.

The square root of 2140028021 is about 46260.4368872582. The cubic root of 2140028021 is about 1288.6643670513.

Adding to 2140028021 its reverse (1208200412), we get a palindrome (3348228433).

The spelling of 2140028021 in words is "two billion, one hundred forty million, twenty-eight thousand, twenty-one".