1101212121 has 4 divisors (see below), whose sum is σ = 1468282832. Its totient is φ = 734141412.

The previous prime is 1101212107. The next prime is 1101212137. The reversal of 1101212121 is 1212121011.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1212121011 = 3 ⋅404040337.

It is not a de Polignac number, because 1101212121 - 2¹¹ = 1101210073 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1101212097 and 1101212106.

It is not an unprimeable number, because it can be changed into a prime (1101212921) 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, 183535351 + ... + 183535356.

It is an arithmetic number, because the mean of its divisors is an integer number (367070708).

Almost surely, 2^1101212121 is an apocalyptic number.

It is an amenable number.

1101212121 is a deficient number, since it is larger than the sum of its proper divisors (367070711).

1101212121 is an equidigital number, since it uses as much as digits as its factorization.

1101212121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 367070710.

The product of its (nonzero) digits is 8, while the sum is 12.

The square root of 1101212121 is about 33184.5162839539. The cubic root of 1101212121 is about 1032.6591424538.

Adding to 1101212121 its reverse (1212121011), we get a palindrome (2313333132).

The spelling of 1101212121 in words is "one billion, one hundred one million, two hundred twelve thousand, one hundred twenty-one".