7238570821 has 2 divisors, whose sum is σ = 7238570822. Its totient is φ = 7238570820.

The previous prime is 7238570791. The next prime is 7238570831. The reversal of 7238570821 is 1280758327.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6801300900 + 437269921 = 82470^2 + 20911^2 .

It is a cyclic number.

It is not a de Polignac number, because 7238570821 - 2⁷ = 7238570693 is a prime.

It is a super-2 number, since 2×7238570821² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7238570831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3619285410 + 3619285411.

It is an arithmetic number, because the mean of its divisors is an integer number (3619285411).

Almost surely, 2^7238570821 is an apocalyptic number.

It is an amenable number.

7238570821 is a deficient number, since it is larger than the sum of its proper divisors (1).

7238570821 is an equidigital number, since it uses as much as digits as its factorization.

7238570821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 188160, while the sum is 43.

The square root of 7238570821 is about 85079.7909082997. The cubic root of 7238570821 is about 1934.4207522656.

The spelling of 7238570821 in words is "seven billion, two hundred thirty-eight million, five hundred seventy thousand, eight hundred twenty-one".