7238898421 has 2 divisors, whose sum is σ = 7238898422. Its totient is φ = 7238898420.

The previous prime is 7238898419. The next prime is 7238898427. The reversal of 7238898421 is 1248988327.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6117586225 + 1121312196 = 78215^2 + 33486^2 .

It is a cyclic number.

It is not a de Polignac number, because 7238898421 - 2¹ = 7238898419 is a prime.

Together with 7238898419, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7238898427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3619449210 + 3619449211.

It is an arithmetic number, because the mean of its divisors is an integer number (3619449211).

Almost surely, 2^7238898421 is an apocalyptic number.

It is an amenable number.

7238898421 is a deficient number, since it is larger than the sum of its proper divisors (1).

7238898421 is an equidigital number, since it uses as much as digits as its factorization.

7238898421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1548288, while the sum is 52.

The square root of 7238898421 is about 85081.7161380752. The cubic root of 7238898421 is about 1934.4499342084.

The spelling of 7238898421 in words is "seven billion, two hundred thirty-eight million, eight hundred ninety-eight thousand, four hundred twenty-one".