7152440021 has 2 divisors, whose sum is σ = 7152440022. Its totient is φ = 7152440020.

The previous prime is 7152440011. The next prime is 7152440033. The reversal of 7152440021 is 1200442517.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6666722500 + 485717521 = 81650^2 + 22039^2 .

It is an emirp because it is prime and its reverse (1200442517) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7152440021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7152440011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3576220010 + 3576220011.

It is an arithmetic number, because the mean of its divisors is an integer number (3576220011).

Almost surely, 2^7152440021 is an apocalyptic number.

It is an amenable number.

7152440021 is a deficient number, since it is larger than the sum of its proper divisors (1).

7152440021 is an equidigital number, since it uses as much as digits as its factorization.

7152440021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2240, while the sum is 26.

The square root of 7152440021 is about 84572.0995423432. The cubic root of 7152440021 is about 1926.7176457332.

Adding to 7152440021 its reverse (1200442517), we get a palindrome (8352882538).

The spelling of 7152440021 in words is "seven billion, one hundred fifty-two million, four hundred forty thousand, twenty-one".