2147310021 has 4 divisors (see below), whose sum is σ = 2863080032. Its totient is φ = 1431540012.

The previous prime is 2147310019. The next prime is 2147310071. The reversal of 2147310021 is 1200137412.

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 not a de Polignac number, because 2147310021 - 2¹ = 2147310019 is a prime.

It is a super-2 number, since 2×2147310021² = 9221880652574040882, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2147310021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2147310071) 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, 357885001 + ... + 357885006.

It is an arithmetic number, because the mean of its divisors is an integer number (715770008).

Almost surely, 2^2147310021 is an apocalyptic number.

It is an amenable number.

2147310021 is a deficient number, since it is larger than the sum of its proper divisors (715770011).

2147310021 is an equidigital number, since it uses as much as digits as its factorization.

2147310021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 715770010.

The product of its (nonzero) digits is 336, while the sum is 21.

The square root of 2147310021 is about 46339.0766092722. The cubic root of 2147310021 is about 1290.1243837758.

Adding to 2147310021 its reverse (1200137412), we get a palindrome (3347447433).

The spelling of 2147310021 in words is "two billion, one hundred forty-seven million, three hundred ten thousand, twenty-one".