1212202200221 has 4 divisors (see below), whose sum is σ = 1212205016412. Its totient is φ = 1212199384032.

The previous prime is 1212202200191. The next prime is 1212202200233. The reversal of 1212202200221 is 1220022022121.

It is a happy number.

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 223889848900 + 988312351321 = 473170^2 + 994139^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1212202200221 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 1212202200221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212202209221) 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, 612650 + ... + 1673243.

It is an arithmetic number, because the mean of its divisors is an integer number (303051254103).

Almost surely, 2^{1212202200221} is an apocalyptic number.

It is an amenable number.

1212202200221 is a deficient number, since it is larger than the sum of its proper divisors (2816191).

1212202200221 is an equidigital number, since it uses as much as digits as its factorization.

1212202200221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2816190.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 1212202200221 its reverse (1220022022121), we get a palindrome (2432224222342).

The spelling of 1212202200221 in words is "one trillion, two hundred twelve billion, two hundred two million, two hundred thousand, two hundred twenty-one".