20121102123311 has 4 divisors (see below), whose sum is σ = 22995545283792. Its totient is φ = 17246658962832.

The previous prime is 20121102123301. The next prime is 20121102123313. The reversal of 20121102123311 is 11332120112102.

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 20121102123311 - 2⁶ = 20121102123247 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20121102123313) 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, 1437221580230 + ... + 1437221580243.

It is an arithmetic number, because the mean of its divisors is an integer number (5748886320948).

Almost surely, 2^{20121102123311} is an apocalyptic number.

20121102123311 is a deficient number, since it is larger than the sum of its proper divisors (2874443160481).

20121102123311 is an equidigital number, since it uses as much as digits as its factorization.

20121102123311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2874443160480.

The product of its (nonzero) digits is 144, while the sum is 20.

Adding to 20121102123311 its reverse (11332120112102), we get a palindrome (31453222235413).

The spelling of 20121102123311 in words is "twenty trillion, one hundred twenty-one billion, one hundred two million, one hundred twenty-three thousand, three hundred eleven".