2121311432011 has 4 divisors (see below), whose sum is σ = 2121332347224. Its totient is φ = 2121290516800.

The previous prime is 2121311431991. The next prime is 2121311432027. The reversal of 2121311432011 is 1102341131212.

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 2121311432011 - 2¹⁵ = 2121311399243 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2121311432041) 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, 10304725 + ... + 10508566.

It is an arithmetic number, because the mean of its divisors is an integer number (530333086806).

Almost surely, 2^{2121311432011} is an apocalyptic number.

2121311432011 is a deficient number, since it is larger than the sum of its proper divisors (20915213).

2121311432011 is a wasteful number, since it uses less digits than its factorization.

2121311432011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20915212.

The product of its (nonzero) digits is 288, while the sum is 22.

Adding to 2121311432011 its reverse (1102341131212), we get a palindrome (3223652563223).

The spelling of 2121311432011 in words is "two trillion, one hundred twenty-one billion, three hundred eleven million, four hundred thirty-two thousand, eleven".