720100621 has 2 divisors, whose sum is σ = 720100622. Its totient is φ = 720100620.

The previous prime is 720100607. The next prime is 720100663. The reversal of 720100621 is 126001027.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 600985225 + 119115396 = 24515^2 + 10914^2 .

It is a cyclic number.

It is not a de Polignac number, because 720100621 - 2¹¹ = 720098573 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (720100681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360050310 + 360050311.

It is an arithmetic number, because the mean of its divisors is an integer number (360050311).

Almost surely, 2^720100621 is an apocalyptic number.

It is an amenable number.

720100621 is a deficient number, since it is larger than the sum of its proper divisors (1).

720100621 is an equidigital number, since it uses as much as digits as its factorization.

720100621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 168, while the sum is 19.

The square root of 720100621 is about 26834.6906261280. The cubic root of 720100621 is about 896.3226995358.

Adding to 720100621 its reverse (126001027), we get a palindrome (846101648).

It can be divided in two parts, 7201006 and 21, that added together give a palindrome (7201027).

The spelling of 720100621 in words is "seven hundred twenty million, one hundred thousand, six hundred twenty-one".