1212021111111 has 8 divisors (see below), whose sum is σ = 1619015263344. Its totient is φ = 806520516480.

The previous prime is 1212021111101. The next prime is 1212021111113. The reversal of 1212021111111 is 1111111202121.

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

It is not a de Polignac number, because 1212021111111 - 2⁵ = 1212021111079 is a prime.

1212021111111 is a modest number, since divided by 1111111 gives 121202 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212021111113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 373387506 + ... + 373390751.

It is an arithmetic number, because the mean of its divisors is an integer number (202376907918).

Almost surely, 2^{1212021111111} is an apocalyptic number.

1212021111111 is a deficient number, since it is larger than the sum of its proper divisors (406994152233).

1212021111111 is an equidigital number, since it uses as much as digits as its factorization.

1212021111111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 746778801.

The product of its (nonzero) digits is 8, while the sum is 15.

Adding to 1212021111111 its reverse (1111111202121), we get a palindrome (2323132313232).

The spelling of 1212021111111 in words is "one trillion, two hundred twelve billion, twenty-one million, one hundred eleven thousand, one hundred eleven".