21113211031331 has 4 divisors (see below), whose sum is σ = 21126349309872. Its totient is φ = 21100072752792.

The previous prime is 21113211031303. The next prime is 21113211031357. The reversal of 21113211031331 is 13313011231112.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21113211031331 is a prime.

It is a super-2 number, since 2×21113211031331² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21113211031297 and 21113211031306.

It is not an unprimeable number, because it can be changed into a prime (21113211031931) 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, 6569136860 + ... + 6569140073.

It is an arithmetic number, because the mean of its divisors is an integer number (5281587327468).

Almost surely, 2^{21113211031331} is an apocalyptic number.

21113211031331 is a deficient number, since it is larger than the sum of its proper divisors (13138278541).

21113211031331 is a wasteful number, since it uses less digits than its factorization.

21113211031331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13138278540.

The product of its (nonzero) digits is 324, while the sum is 23.

Adding to 21113211031331 its reverse (13313011231112), we get a palindrome (34426222262443).

The spelling of 21113211031331 in words is "twenty-one trillion, one hundred thirteen billion, two hundred eleven million, thirty-one thousand, three hundred thirty-one".