1221200012222 has 4 divisors (see below), whose sum is σ = 1831800018336. Its totient is φ = 610600006110.

The previous prime is 1221200012189. The next prime is 1221200012231. The reversal of 1221200012222 is 2222100021221.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a self number, because there is not a number n which added to its sum of digits gives 1221200012222.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 305300003054 + ... + 305300003057.

It is an arithmetic number, because the mean of its divisors is an integer number (457950004584).

Almost surely, 2^{1221200012222} is an apocalyptic number.

1221200012222 is a deficient number, since it is larger than the sum of its proper divisors (610600006114).

1221200012222 is an equidigital number, since it uses as much as digits as its factorization.

1221200012222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 610600006113.

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

Adding to 1221200012222 its reverse (2222100021221), we get a palindrome (3443300033443).

The spelling of 1221200012222 in words is "one trillion, two hundred twenty-one billion, two hundred million, twelve thousand, two hundred twenty-two".