21000121331311 has 16 divisors (see below), whose sum is σ = 22338896065920. Its totient is φ = 19672920977920.

The previous prime is 21000121331263. The next prime is 21000121331333. The reversal of 21000121331311 is 11313312100012.

It is not a de Polignac number, because 21000121331311 - 2⁷ = 21000121331183 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21000121331011) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7491825 + ... + 9905941.

It is an arithmetic number, because the mean of its divisors is an integer number (1396181004120).

Almost surely, 2^{21000121331311} is an apocalyptic number.

21000121331311 is a deficient number, since it is larger than the sum of its proper divisors (1338774734609).

21000121331311 is a wasteful number, since it uses less digits than its factorization.

21000121331311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2416514.

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

Adding to 21000121331311 its reverse (11313312100012), we get a palindrome (32313433431323).

The spelling of 21000121331311 in words is "twenty-one trillion, one hundred twenty-one million, three hundred thirty-one thousand, three hundred eleven".