121220111220224 has 80 divisors (see below), whose sum is σ = 258541876010880. Its totient is φ = 56611319224320.

The previous prime is 121220111220217. The next prime is 121220111220227. The reversal of 121220111220224 is 422022111022121.

It is a happy number.

It is a super-2 number, since 2×121220111220224² (a number of 29 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 121220111220224.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121220111220227) 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, 87062474 + ... + 88443849.

It is an arithmetic number, because the mean of its divisors is an integer number (3231773450136).

Almost surely, 2^{121220111220224} is an apocalyptic number.

It is an amenable number.

121220111220224 is an abundant number, since it is smaller than the sum of its proper divisors (137321764790656).

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

121220111220224 is an equidigital number, since it uses as much as digits as its factorization.

121220111220224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 175506431 (or 175506415 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 23.

Adding to 121220111220224 its reverse (422022111022121), we get a palindrome (543242222242345).

The spelling of 121220111220224 in words is "one hundred twenty-one trillion, two hundred twenty billion, one hundred eleven million, two hundred twenty thousand, two hundred twenty-four".