221221002211224 has 64 divisors (see below), whose sum is σ = 616405269340800. Its totient is φ = 65749895391744.

The previous prime is 221221002211213. The next prime is 221221002211259. The reversal of 221221002211224 is 422112200122122.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a junction number, because it is equal to n+sod(n) for n = 221221002211194 and 221221002211203.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14268632742 + ... + 14268648245.

It is an arithmetic number, because the mean of its divisors is an integer number (9631332333450).

Almost surely, 2^{221221002211224} is an apocalyptic number.

221221002211224 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

221221002211224 is an abundant number, since it is smaller than the sum of its proper divisors (395184267129576).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221221002211224 is a wasteful number, since it uses less digits than its factorization.

221221002211224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28537281032 (or 28537281028 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 24.

Adding to 221221002211224 its reverse (422112200122122), we get a palindrome (643333202333346).

The spelling of 221221002211224 in words is "two hundred twenty-one trillion, two hundred twenty-one billion, two million, two hundred eleven thousand, two hundred twenty-four".