121231331011 has 32 divisors (see below), whose sum is σ = 147796275200. Its totient is φ = 97133243040.

The previous prime is 121231330991. The next prime is 121231331041. The reversal of 121231331011 is 110133132121.

It is a cyclic number.

It is not a de Polignac number, because 121231331011 - 2¹¹ = 121231328963 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a self number, because there is not a number n which added to its sum of digits gives 121231331011.

It is not an unprimeable number, because it can be changed into a prime (121231331041) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2993266 + ... + 3033496.

It is an arithmetic number, because the mean of its divisors is an integer number (4618633600).

Almost surely, 2^121231331011 is an apocalyptic number.

121231331011 is a deficient number, since it is larger than the sum of its proper divisors (26564944189).

121231331011 is a wasteful number, since it uses less digits than its factorization.

121231331011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40559.

The product of its (nonzero) digits is 108, while the sum is 19.

Adding to 121231331011 its reverse (110133132121), we get a palindrome (231364463132).

The spelling of 121231331011 in words is "one hundred twenty-one billion, two hundred thirty-one million, three hundred thirty-one thousand, eleven".