7315021 has 4 divisors (see below), whose sum is σ = 8360032. Its totient is φ = 6270012.

The previous prime is 7315013. The next prime is 7315027. The reversal of 7315021 is 1205137.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1205137 = 271 ⋅4447.

It is not a de Polignac number, because 7315021 - 2³ = 7315013 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 15.

It is a self number, because there is not a number n which added to its sum of digits gives 7315021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7315027) 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, 522495 + ... + 522508.

It is an arithmetic number, because the mean of its divisors is an integer number (2090008).

Almost surely, 2^7315021 is an apocalyptic number.

It is an amenable number.

7315021 is a deficient number, since it is larger than the sum of its proper divisors (1045011).

7315021 is a wasteful number, since it uses less digits than its factorization.

7315021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1045010.

The product of its (nonzero) digits is 210, while the sum is 19.

The square root of 7315021 is about 2704.6295494947. The cubic root of 7315021 is about 194.1207046332.

The spelling of 7315021 in words is "seven million, three hundred fifteen thousand, twenty-one".