1212221021111 has 16 divisors (see below), whose sum is σ = 1223757393408. Its totient is φ = 1200721267200.

The previous prime is 1212221021107. The next prime is 1212221021213. The reversal of 1212221021111 is 1111201222121.

It is not a de Polignac number, because 1212221021111 - 2² = 1212221021107 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 1212221021111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212221021311) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 283823906 + ... + 283828176.

It is an arithmetic number, because the mean of its divisors is an integer number (76484837088).

Almost surely, 2^{1212221021111} is an apocalyptic number.

1212221021111 is a deficient number, since it is larger than the sum of its proper divisors (11536372297).

1212221021111 is a wasteful number, since it uses less digits than its factorization.

1212221021111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7942.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 1212221021111 its reverse (1111201222121), we get a palindrome (2323422243232).

The spelling of 1212221021111 in words is "one trillion, two hundred twelve billion, two hundred twenty-one million, twenty-one thousand, one hundred eleven".