20121001123311 has 24 divisors (see below), whose sum is σ = 31726638193536. Its totient is φ = 12186539119440.

The previous prime is 20121001123271. The next prime is 20121001123411. The reversal of 20121001123311 is 11332110012102.

20121001123311 is a `hidden beast` number, since 20 + 1 + 210 + 0 + 1 + 123 + 311 = 666.

It is not a de Polignac number, because 20121001123311 - 2²⁵ = 20120967568879 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20121001123411) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 66573595 + ... + 66875148.

It is an arithmetic number, because the mean of its divisors is an integer number (1321943258064).

Almost surely, 2^{20121001123311} is an apocalyptic number.

20121001123311 is a deficient number, since it is larger than the sum of its proper divisors (11605637070225).

20121001123311 is a wasteful number, since it uses less digits than its factorization.

20121001123311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133450283 (or 133450280 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

Adding to 20121001123311 its reverse (11332110012102), we get a palindrome (31453111135413).

The spelling of 20121001123311 in words is "twenty trillion, one hundred twenty-one billion, one million, one hundred twenty-three thousand, three hundred eleven".