1221000221211 has 8 divisors (see below), whose sum is σ = 1628013468480. Its totient is φ = 813993560712.

The previous prime is 1221000221141. The next prime is 1221000221213. The reversal of 1221000221211 is 1121220001221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1221000221211 - 2¹⁹ = 1220999696923 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1221000221213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1196581 + ... + 1968198.

It is an arithmetic number, because the mean of its divisors is an integer number (203501683560).

Almost surely, 2^{1221000221211} is an apocalyptic number.

1221000221211 is a deficient number, since it is larger than the sum of its proper divisors (407013247269).

1221000221211 is a wasteful number, since it uses less digits than its factorization.

1221000221211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3293385.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 1221000221211 its reverse (1121220001221), we get a palindrome (2342220222432).

The spelling of 1221000221211 in words is "one trillion, two hundred twenty-one billion, two hundred twenty-one thousand, two hundred eleven".