1212131221111 has 8 divisors (see below), whose sum is σ = 1218861632880. Its totient is φ = 1205417286528.

The previous prime is 1212131221109. The next prime is 1212131221151. The reversal of 1212131221111 is 1111221312121.

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

It is a cyclic number.

It is not a de Polignac number, because 1212131221111 - 2¹ = 1212131221109 is a prime.

It is a super-3 number, since 3×1212131221111³ (a number of 37 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212131221151) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3971746 + ... + 4266031.

It is an arithmetic number, because the mean of its divisors is an integer number (152357704110).

Almost surely, 2^{1212131221111} is an apocalyptic number.

1212131221111 is a deficient number, since it is larger than the sum of its proper divisors (6730411769).

1212131221111 is an equidigital number, since it uses as much as digits as its factorization.

1212131221111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8238593.

The product of its digits is 48, while the sum is 19.

Adding to 1212131221111 its reverse (1111221312121), we get a palindrome (2323352533232).

The spelling of 1212131221111 in words is "one trillion, two hundred twelve billion, one hundred thirty-one million, two hundred twenty-one thousand, one hundred eleven".