20041221217 has 8 divisors (see below), whose sum is σ = 20716508160. Its totient is φ = 19367734080.

The previous prime is 20041221209. The next prime is 20041221227. The reversal of 20041221217 is 71212214002.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20041221217 - 2³ = 20041221209 is a prime.

It is a super-2 number, since 2×20041221217² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20041221227) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 427288 + ... + 471865.

It is an arithmetic number, because the mean of its divisors is an integer number (2589563520).

Almost surely, 2^20041221217 is an apocalyptic number.

It is an amenable number.

20041221217 is a deficient number, since it is larger than the sum of its proper divisors (675286943).

20041221217 is an equidigital number, since it uses as much as digits as its factorization.

20041221217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 899903.

The product of its (nonzero) digits is 448, while the sum is 22.

Adding to 20041221217 its reverse (71212214002), we get a palindrome (91253435219).

It can be divided in two parts, 2004 and 1221217, that added together give a palindrome (1223221).

The spelling of 20041221217 in words is "twenty billion, forty-one million, two hundred twenty-one thousand, two hundred seventeen".