21111133113131 has 4 divisors (see below), whose sum is σ = 21148630685832. Its totient is φ = 21073635540432.

The previous prime is 21111133113113. The next prime is 21111133113173. The reversal of 21111133113131 is 13131133111112.

It is a happy number.

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 21111133113131 - 2²² = 21111128918827 is a prime.

It is a super-2 number, since 2×21111133113131² (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 = 21111133113097 and 21111133113106.

It is not an unprimeable number, because it can be changed into a prime (21111133112131) 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, 18748785506 + ... + 18748786631.

It is an arithmetic number, because the mean of its divisors is an integer number (5287157671458).

Almost surely, 2^{21111133113131} is an apocalyptic number.

21111133113131 is a deficient number, since it is larger than the sum of its proper divisors (37497572701).

21111133113131 is an equidigital number, since it uses as much as digits as its factorization.

21111133113131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37497572700.

The product of its digits is 162, while the sum is 23.

Adding to 21111133113131 its reverse (13131133111112), we get a palindrome (34242266224243).

The spelling of 21111133113131 in words is "twenty-one trillion, one hundred eleven billion, one hundred thirty-three million, one hundred thirteen thousand, one hundred thirty-one".