1212211021111 has 4 divisors (see below), whose sum is σ = 1212568503424. Its totient is φ = 1211853538800.

The previous prime is 1212211021103. The next prime is 1212211021117. The reversal of 1212211021111 is 1111201122121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1212211021111 - 2³ = 1212211021103 is a prime.

It is a super-3 number, since 3×1212211021111³ (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 (1212211021117) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 178736070 + ... + 178742851.

It is an arithmetic number, because the mean of its divisors is an integer number (303142125856).

Almost surely, 2^{1212211021111} is an apocalyptic number.

1212211021111 is a deficient number, since it is larger than the sum of its proper divisors (357482313).

1212211021111 is an equidigital number, since it uses as much as digits as its factorization.

1212211021111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 357482312.

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

Adding to 1212211021111 its reverse (1111201122121), we get a palindrome (2323412143232).

The spelling of 1212211021111 in words is "one trillion, two hundred twelve billion, two hundred eleven million, twenty-one thousand, one hundred eleven".