1224210214121 has 4 divisors (see below), whose sum is σ = 1224213830100. Its totient is φ = 1224206598144.

The previous prime is 1224210214063. The next prime is 1224210214133. The reversal of 1224210214121 is 1214120124221.

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 474981477721 + 749228736400 = 689189^2 + 865580^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1224210214121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1224210214321) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1240856 + ... + 1997033.

It is an arithmetic number, because the mean of its divisors is an integer number (306053457525).

Almost surely, 2^{1224210214121} is an apocalyptic number.

It is an amenable number.

1224210214121 is a deficient number, since it is larger than the sum of its proper divisors (3615979).

1224210214121 is an equidigital number, since it uses as much as digits as its factorization.

1224210214121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3615978.

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

Adding to 1224210214121 its reverse (1214120124221), we get a palindrome (2438330338342).

The spelling of 1224210214121 in words is "one trillion, two hundred twenty-four billion, two hundred ten million, two hundred fourteen thousand, one hundred twenty-one".