7512011621 has 2 divisors, whose sum is σ = 7512011622. Its totient is φ = 7512011620.

The previous prime is 7512011609. The next prime is 7512011743. The reversal of 7512011621 is 1261102157.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5900390596 + 1611621025 = 76814^2 + 40145^2 .

It is a cyclic number.

It is not a de Polignac number, because 7512011621 - 2⁶ = 7512011557 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7512011821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3756005810 + 3756005811.

It is an arithmetic number, because the mean of its divisors is an integer number (3756005811).

Almost surely, 2^7512011621 is an apocalyptic number.

It is an amenable number.

7512011621 is a deficient number, since it is larger than the sum of its proper divisors (1).

7512011621 is an equidigital number, since it uses as much as digits as its factorization.

7512011621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 840, while the sum is 26.

The square root of 7512011621 is about 86671.8617603199. The cubic root of 7512011621 is about 1958.4782389173.

Adding to 7512011621 its reverse (1261102157), we get a palindrome (8773113778).

The spelling of 7512011621 in words is "seven billion, five hundred twelve million, eleven thousand, six hundred twenty-one".