1224640464221 has 4 divisors (see below), whose sum is σ = 1224732465852. Its totient is φ = 1224548462592.

The previous prime is 1224640464169. The next prime is 1224640464233.

1224640464221 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 562516500121 + 662123964100 = 750011^2 + 813710^2 .

It is a cyclic number.

It is not a de Polignac number, because 1224640464221 - 2¹⁴ = 1224640447837 is a prime.

It is a super-2 number, since 2×1224640464221² (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 (1224640466221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45980846 + ... + 46007471.

It is an arithmetic number, because the mean of its divisors is an integer number (306183116463).

Almost surely, 2^{1224640464221} is an apocalyptic number.

It is an amenable number.

1224640464221 is a deficient number, since it is larger than the sum of its proper divisors (92001631).

1224640464221 is an equidigital number, since it uses as much as digits as its factorization.

1224640464221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92001630.

The product of its (nonzero) digits is 147456, while the sum is 38.

It can be divided in two parts, 1224640 and 464221, that added together give a palindrome (1688861).

The spelling of 1224640464221 in words is "one trillion, two hundred twenty-four billion, six hundred forty million, four hundred sixty-four thousand, two hundred twenty-one".