1212320010221 has 4 divisors (see below), whose sum is σ = 1235193972732. Its totient is φ = 1189446047712.

The previous prime is 1212320010169. The next prime is 1212320010233. The reversal of 1212320010221 is 1220100232121.

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 709654608100 + 502665402121 = 842410^2 + 708989^2 .

It is a cyclic number.

It is not a de Polignac number, because 1212320010221 - 2¹⁴ = 1212319993837 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1212320010221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212320010281) 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, 11436981176 + ... + 11436981281.

It is an arithmetic number, because the mean of its divisors is an integer number (308798493183).

Almost surely, 2^{1212320010221} is an apocalyptic number.

It is an amenable number.

1212320010221 is a deficient number, since it is larger than the sum of its proper divisors (22873962511).

1212320010221 is an equidigital number, since it uses as much as digits as its factorization.

1212320010221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22873962510.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 1212320010221 its reverse (1220100232121), we get a palindrome (2432420242342).

The spelling of 1212320010221 in words is "one trillion, two hundred twelve billion, three hundred twenty million, ten thousand, two hundred twenty-one".