7023421 has 2 divisors, whose sum is σ = 7023422. Its totient is φ = 7023420.

The previous prime is 7023383. The next prime is 7023427. The reversal of 7023421 is 1243207.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6400900 + 622521 = 2530^2 + 789^2 .

It is a cyclic number.

It is not a de Polignac number, because 7023421 - 2²¹ = 4926269 is a prime.

It is a d-powerful number, because it can be written as 7⁸ + 0 + 2⁷ + 3¹¹ + 4¹⁰ + 2¹⁵ + 1 .

7023421 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7023427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3511710 + 3511711.

It is an arithmetic number, because the mean of its divisors is an integer number (3511711).

Almost surely, 2^7023421 is an apocalyptic number.

It is an amenable number.

7023421 is a deficient number, since it is larger than the sum of its proper divisors (1).

7023421 is an equidigital number, since it uses as much as digits as its factorization.

7023421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 336, while the sum is 19.

The square root of 7023421 is about 2650.1737678877. The cubic root of 7023421 is about 191.5062272583.

Adding to 7023421 its reverse (1243207), we get a palindrome (8266628).

The spelling of 7023421 in words is "seven million, twenty-three thousand, four hundred twenty-one".