121311212011 has 16 divisors (see below), whose sum is σ = 135645840000. Its totient is φ = 107536302720.

The previous prime is 121311211933. The next prime is 121311212021. The reversal of 121311212011 is 110212113121.

It is a happy number.

It is not a de Polignac number, because 121311212011 - 2¹⁹ = 121310687723 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121311212021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 64240 + ... + 496738.

It is an arithmetic number, because the mean of its divisors is an integer number (8477865000).

Almost surely, 2^121311212011 is an apocalyptic number.

121311212011 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

121311212011 is a deficient number, since it is larger than the sum of its proper divisors (14334627989).

121311212011 is a wasteful number, since it uses less digits than its factorization.

121311212011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 433146.

The product of its (nonzero) digits is 24, while the sum is 16.

Adding to 121311212011 its reverse (110212113121), we get a palindrome (231523325132).

The spelling of 121311212011 in words is "one hundred twenty-one billion, three hundred eleven million, two hundred twelve thousand, eleven".