1101211212121 has 4 divisors (see below), whose sum is σ = 1104538134544. Its totient is φ = 1097884289700.

The previous prime is 1101211212109. The next prime is 1101211212133. The reversal of 1101211212121 is 1212121121011.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (1101211212109) and next prime (1101211212133).

It is a cyclic number.

It is not a de Polignac number, because 1101211212121 - 2¹⁷ = 1101211081049 is a prime.

It is a super-2 number, since 2×1101211212121² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1101211212095 and 1101211212104.

It is not an unprimeable number, because it can be changed into a prime (1101211212221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1663460715 + ... + 1663461376.

It is an arithmetic number, because the mean of its divisors is an integer number (276134533636).

Almost surely, 2^{1101211212121} is an apocalyptic number.

It is an amenable number.

1101211212121 is a deficient number, since it is larger than the sum of its proper divisors (3326922423).

1101211212121 is an equidigital number, since it uses as much as digits as its factorization.

1101211212121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3326922422.

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

Adding to 1101211212121 its reverse (1212121121011), we get a palindrome (2313332333132).

The spelling of 1101211212121 in words is "one trillion, one hundred one billion, two hundred eleven million, two hundred twelve thousand, one hundred twenty-one".