12121011211121 has 8 divisors (see below), whose sum is σ = 12183918610920. Its totient is φ = 12058104886272.

The previous prime is 12121011211117. The next prime is 12121011211129. The reversal of 12121011211121 is 12111211012121.

It can be written as a sum of positive squares in 4 ways, for example, as 910306810000 + 11210704401121 = 954100^2 + 3348239^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12121011211121 - 2² = 12121011211117 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 12121011211121.

It is not an unprimeable number, because it can be changed into a prime (12121011211129) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32988011 + ... + 33353423.

It is an arithmetic number, because the mean of its divisors is an integer number (1522989826365).

Almost surely, 2^{12121011211121} is an apocalyptic number.

It is an amenable number.

12121011211121 is a deficient number, since it is larger than the sum of its proper divisors (62907399799).

12121011211121 is a wasteful number, since it uses less digits than its factorization.

12121011211121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 537475.

The product of its (nonzero) digits is 16, while the sum is 17.

Adding to 12121011211121 its reverse (12111211012121), we get a palindrome (24232222223242).

The spelling of 12121011211121 in words is "twelve trillion, one hundred twenty-one billion, eleven million, two hundred eleven thousand, one hundred twenty-one".