4215316621 has 2 divisors, whose sum is σ = 4215316622. Its totient is φ = 4215316620.

The previous prime is 4215316619. The next prime is 4215316673. The reversal of 4215316621 is 1266135124.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3112412521 + 1102904100 = 55789^2 + 33210^2 .

It is a cyclic number.

It is not a de Polignac number, because 4215316621 - 2¹ = 4215316619 is a prime.

Together with 4215316619, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4215316691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2107658310 + 2107658311.

It is an arithmetic number, because the mean of its divisors is an integer number (2107658311).

Almost surely, 2^4215316621 is an apocalyptic number.

It is an amenable number.

4215316621 is a deficient number, since it is larger than the sum of its proper divisors (1).

4215316621 is an equidigital number, since it uses as much as digits as its factorization.

4215316621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8640, while the sum is 31.

The square root of 4215316621 is about 64925.4697403107. The cubic root of 4215316621 is about 1615.3875583606.

The spelling of 4215316621 in words is "four billion, two hundred fifteen million, three hundred sixteen thousand, six hundred twenty-one".