21111000321131 has 4 divisors (see below), whose sum is σ = 24126857509872. Its totient is φ = 18095143132392.

The previous prime is 21111000321109. The next prime is 21111000321143. The reversal of 21111000321131 is 13112300011112.

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 21111000321131 - 2¹⁴ = 21111000304747 is a prime.

It is a super-2 number, since 2×21111000321131² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21111000321101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1507928594360 + ... + 1507928594373.

It is an arithmetic number, because the mean of its divisors is an integer number (6031714377468).

Almost surely, 2^{21111000321131} is an apocalyptic number.

21111000321131 is a deficient number, since it is larger than the sum of its proper divisors (3015857188741).

21111000321131 is an equidigital number, since it uses as much as digits as its factorization.

21111000321131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3015857188740.

The product of its (nonzero) digits is 36, while the sum is 17.

Adding to 21111000321131 its reverse (13112300011112), we get a palindrome (34223300332243).

The spelling of 21111000321131 in words is "twenty-one trillion, one hundred eleven billion, three hundred twenty-one thousand, one hundred thirty-one".