7421026621 has 2 divisors, whose sum is σ = 7421026622. Its totient is φ = 7421026620.

The previous prime is 7421026523. The next prime is 7421026637. The reversal of 7421026621 is 1266201247.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7415620996 + 5405625 = 86114^2 + 2325^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7421026621 is a prime.

It is a super-2 number, since 2×7421026621² (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 (7421026121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3710513310 + 3710513311.

It is an arithmetic number, because the mean of its divisors is an integer number (3710513311).

Almost surely, 2^7421026621 is an apocalyptic number.

It is an amenable number.

7421026621 is a deficient number, since it is larger than the sum of its proper divisors (1).

7421026621 is an equidigital number, since it uses as much as digits as its factorization.

7421026621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 7421026621 is about 86145.3807293229. The cubic root of 7421026621 is about 1950.5391120393.

Adding to 7421026621 its reverse (1266201247), we get a palindrome (8687227868).

The spelling of 7421026621 in words is "seven billion, four hundred twenty-one million, twenty-six thousand, six hundred twenty-one".