1212221011111 has 16 divisors (see below), whose sum is σ = 1339848928800. Its totient is φ = 1087544972800.

The previous prime is 1212221011061. The next prime is 1212221011121. The reversal of 1212221011111 is 1111101222121.

It is not a de Polignac number, because 1212221011111 - 2¹³ = 1212221002919 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212221011121) 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, 678256 + ... + 1698373.

It is an arithmetic number, because the mean of its divisors is an integer number (83740558050).

Almost surely, 2^{1212221011111} is an apocalyptic number.

1212221011111 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1212221011111 is a deficient number, since it is larger than the sum of its proper divisors (127627917689).

1212221011111 is a wasteful number, since it uses less digits than its factorization.

1212221011111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2377250.

The product of its (nonzero) digits is 16, while the sum is 16.

Adding to 1212221011111 its reverse (1111101222121), we get a palindrome (2323322233232).

The spelling of 1212221011111 in words is "one trillion, two hundred twelve billion, two hundred twenty-one million, eleven thousand, one hundred eleven".