7420685621 has 2 divisors, whose sum is σ = 7420685622. Its totient is φ = 7420685620.

The previous prime is 7420685611. The next prime is 7420685669. The reversal of 7420685621 is 1265860247.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6080100625 + 1340584996 = 77975^2 + 36614^2 .

It is an emirp because it is prime and its reverse (1265860247) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7420685621 - 2⁶ = 7420685557 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7420685611) 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, 3710342810 + 3710342811.

It is an arithmetic number, because the mean of its divisors is an integer number (3710342811).

Almost surely, 2^7420685621 is an apocalyptic number.

It is an amenable number.

7420685621 is a deficient number, since it is larger than the sum of its proper divisors (1).

7420685621 is an equidigital number, since it uses as much as digits as its factorization.

7420685621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 161280, while the sum is 41.

The square root of 7420685621 is about 86143.4014942526. The cubic root of 7420685621 is about 1950.5092354891.

The spelling of 7420685621 in words is "seven billion, four hundred twenty million, six hundred eighty-five thousand, six hundred twenty-one".