4215620221 has 2 divisors, whose sum is σ = 4215620222. Its totient is φ = 4215620220.

The previous prime is 4215620137. The next prime is 4215620249. The reversal of 4215620221 is 1220265124.

4215620221 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2305056121 + 1910564100 = 48011^2 + 43710^2 .

It is a cyclic number.

It is not a de Polignac number, because 4215620221 - 2¹³ = 4215612029 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4215620261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2107810110 + 2107810111.

It is an arithmetic number, because the mean of its divisors is an integer number (2107810111).

Almost surely, 2^4215620221 is an apocalyptic number.

It is an amenable number.

4215620221 is a deficient number, since it is larger than the sum of its proper divisors (1).

4215620221 is an equidigital number, since it uses as much as digits as its factorization.

4215620221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 4215620221 is about 64927.8077637001. The cubic root of 4215620221 is about 1615.4263391477.

Adding to 4215620221 its reverse (1220265124), we get a palindrome (5435885345).

The spelling of 4215620221 in words is "four billion, two hundred fifteen million, six hundred twenty thousand, two hundred twenty-one".