7102421 has 4 divisors (see below), whose sum is σ = 7172844. Its totient is φ = 7032000.

The previous prime is 7102411. The next prime is 7102457. The reversal of 7102421 is 1242017.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1242017 = 7 ⋅177431.

It can be written as a sum of positive squares in 2 ways, for example, as 6838225 + 264196 = 2615^2 + 514^2 .

It is a cyclic number.

It is not a de Polignac number, because 7102421 - 2⁶ = 7102357 is a prime.

It is a super-2 number, since 2×7102421² = 100888768122482, 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 7102421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7102411) 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, 35060 + ... + 35261.

It is an arithmetic number, because the mean of its divisors is an integer number (1793211).

Almost surely, 2^7102421 is an apocalyptic number.

It is an amenable number.

7102421 is a deficient number, since it is larger than the sum of its proper divisors (70423).

7102421 is a wasteful number, since it uses less digits than its factorization.

7102421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70422.

The product of its (nonzero) digits is 112, while the sum is 17.

The square root of 7102421 is about 2665.0367727294. The cubic root of 7102421 is about 192.2215775957.

Adding to 7102421 its reverse (1242017), we get a palindrome (8344438).

The spelling of 7102421 in words is "seven million, one hundred two thousand, four hundred twenty-one".