21201111131 has 2 divisors, whose sum is σ = 21201111132. Its totient is φ = 21201111130.

The previous prime is 21201111109. The next prime is 21201111149. The reversal of 21201111131 is 13111110212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21201111131 - 2³⁰ = 20127369307 is a prime.

It is a super-2 number, since 2×21201111131² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21201111101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10600555565 + 10600555566.

It is an arithmetic number, because the mean of its divisors is an integer number (10600555566).

Almost surely, 2^21201111131 is an apocalyptic number.

21201111131 is a deficient number, since it is larger than the sum of its proper divisors (1).

21201111131 is an equidigital number, since it uses as much as digits as its factorization.

21201111131 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12, while the sum is 14.

Adding to 21201111131 its reverse (13111110212), we get a palindrome (34312221343).

The spelling of 21201111131 in words is "twenty-one billion, two hundred one million, one hundred eleven thousand, one hundred thirty-one".