7148728421 has 2 divisors, whose sum is σ = 7148728422. Its totient is φ = 7148728420.

The previous prime is 7148728393. The next prime is 7148728423. The reversal of 7148728421 is 1248278417.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7148702500 + 25921 = 84550^2 + 161^2 .

It is a cyclic number.

It is not a de Polignac number, because 7148728421 - 2⁶ = 7148728357 is a prime.

It is a super-2 number, since 2×7148728421² (a number of 21 digits) contains 22 as substring.

Together with 7148728423, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7148728423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3574364210 + 3574364211.

It is an arithmetic number, because the mean of its divisors is an integer number (3574364211).

Almost surely, 2^7148728421 is an apocalyptic number.

It is an amenable number.

7148728421 is a deficient number, since it is larger than the sum of its proper divisors (1).

7148728421 is an equidigital number, since it uses as much as digits as its factorization.

7148728421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 200704, while the sum is 44.

The square root of 7148728421 is about 84550.1532878563. The cubic root of 7148728421 is about 1926.3843122817.

The spelling of 7148728421 in words is "seven billion, one hundred forty-eight million, seven hundred twenty-eight thousand, four hundred twenty-one".