7138021 has 4 divisors (see below), whose sum is σ = 7786944. Its totient is φ = 6489100.

The previous prime is 7138009. The next prime is 7138039. The reversal of 7138021 is 1208317.

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: 1208317 = 11 ⋅109847.

It is a cyclic number.

It is not a de Polignac number, because 7138021 - 2⁵ = 7137989 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 7137983 and 7138001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7138121) 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, 324445 + ... + 324466.

It is an arithmetic number, because the mean of its divisors is an integer number (1946736).

Almost surely, 2^7138021 is an apocalyptic number.

It is an amenable number.

7138021 is a deficient number, since it is larger than the sum of its proper divisors (648923).

7138021 is a wasteful number, since it uses less digits than its factorization.

7138021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 648922.

The product of its (nonzero) digits is 336, while the sum is 22.

The square root of 7138021 is about 2671.7075064460. The cubic root of 7138021 is about 192.5422047226.

The spelling of 7138021 in words is "seven million, one hundred thirty-eight thousand, twenty-one".