21102213131 has 2 divisors, whose sum is σ = 21102213132. Its totient is φ = 21102213130.

The previous prime is 21102213107. The next prime is 21102213151. The reversal of 21102213131 is 13131220112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21102213131 - 2¹⁰ = 21102212107 is a prime.

It is a super-2 number, since 2×21102213131² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (21102213151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10551106565 + 10551106566.

It is an arithmetic number, because the mean of its divisors is an integer number (10551106566).

Almost surely, 2^21102213131 is an apocalyptic number.

21102213131 is a deficient number, since it is larger than the sum of its proper divisors (1).

21102213131 is an equidigital number, since it uses as much as digits as its factorization.

21102213131 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 21102213131 its reverse (13131220112), we get a palindrome (34233433243).

The spelling of 21102213131 in words is "twenty-one billion, one hundred two million, two hundred thirteen thousand, one hundred thirty-one".