101212121011 has 4 divisors (see below), whose sum is σ = 102158028792. Its totient is φ = 100266213232.

The previous prime is 101212120991. The next prime is 101212121029. The reversal of 101212121011 is 110121212101.

It is a happy number.

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 101212121011 - 2⁵ = 101212120979 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 101212120982 and 101212121000.

It is not an unprimeable number, because it can be changed into a prime (101212125011) 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, 472953730 + ... + 472953943.

It is an arithmetic number, because the mean of its divisors is an integer number (25539507198).

Almost surely, 2^101212121011 is an apocalyptic number.

101212121011 is a deficient number, since it is larger than the sum of its proper divisors (945907781).

101212121011 is an equidigital number, since it uses as much as digits as its factorization.

101212121011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 945907780.

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

Adding to 101212121011 its reverse (110121212101), we get a palindrome (211333333112).

The spelling of 101212121011 in words is "one hundred one billion, two hundred twelve million, one hundred twenty-one thousand, eleven".