2217574827421 has 8 divisors (see below), whose sum is σ = 2218189982904. Its totient is φ = 2216959772160.

The previous prime is 2217574827401. The next prime is 2217574827437. The reversal of 2217574827421 is 1247284757122.

It can be written as a sum of positive squares in 4 ways, for example, as 852390562500 + 1365184264921 = 923250^2 + 1168411^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2217574827421 is a prime.

It is a super-2 number, since 2×2217574827421² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2217574827401) 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, 65411751 + ... + 65445643.

It is an arithmetic number, because the mean of its divisors is an integer number (277273747863).

Almost surely, 2^{2217574827421} is an apocalyptic number.

It is an amenable number.

2217574827421 is a deficient number, since it is larger than the sum of its proper divisors (615155483).

2217574827421 is an equidigital number, since it uses as much as digits as its factorization.

2217574827421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50111.

The product of its digits is 3512320, while the sum is 52.

The spelling of 2217574827421 in words is "two trillion, two hundred seventeen billion, five hundred seventy-four million, eight hundred twenty-seven thousand, four hundred twenty-one".