4217620221 has 6 divisors (see below), whose sum is σ = 6092118110. Its totient is φ = 2811746808.

The previous prime is 4217620139. The next prime is 4217620229. The reversal of 4217620221 is 1220267124.

4217620221 is a `hidden beast` number, since 4 + 2 + 17 + 620 + 2 + 21 = 666.

It can be written as a sum of positive squares in only one way, i.e., 2863748196 + 1353872025 = 53514^2 + 36795^2 .

It is not a de Polignac number, because 4217620221 - 2²¹ = 4215523069 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4217620229) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 234312226 + ... + 234312243.

Almost surely, 2^4217620221 is an apocalyptic number.

It is an amenable number.

4217620221 is a deficient number, since it is larger than the sum of its proper divisors (1874497889).

4217620221 is a wasteful number, since it uses less digits than its factorization.

4217620221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 468624475 (or 468624472 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 4217620221 is about 64943.2076586921. The cubic root of 4217620221 is about 1615.6817655310.

Adding to 4217620221 its reverse (1220267124), we get a palindrome (5437887345).

The spelling of 4217620221 in words is "four billion, two hundred seventeen million, six hundred twenty thousand, two hundred twenty-one".