121212110011 has 4 divisors (see below), whose sum is σ = 121215457792. Its totient is φ = 121208762232.

The previous prime is 121212110009. The next prime is 121212110039. The reversal of 121212110011 is 110011212121.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 110011212121 = 457 ⋅240724753.

It is a cyclic number.

It is not a de Polignac number, because 121212110011 - 2¹ = 121212110009 is a prime.

It is a super-2 number, since 2×121212110011² (a number of 23 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 = 121212109973 and 121212110000.

It is not an unprimeable number, because it can be changed into a prime (121212110111) 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, 1618980 + ... + 1692193.

It is an arithmetic number, because the mean of its divisors is an integer number (30303864448).

Almost surely, 2^121212110011 is an apocalyptic number.

121212110011 is a deficient number, since it is larger than the sum of its proper divisors (3347781).

121212110011 is an equidigital number, since it uses as much as digits as its factorization.

121212110011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3347780.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 121212110011 its reverse (110011212121), we get a palindrome (231223322132).

The spelling of 121212110011 in words is "one hundred twenty-one billion, two hundred twelve million, one hundred ten thousand, eleven".