21115225031 has 2 divisors, whose sum is σ = 21115225032. Its totient is φ = 21115225030.

The previous prime is 21115224997. The next prime is 21115225039. The reversal of 21115225031 is 13052251112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21115225031 - 2¹⁸ = 21114962887 is a prime.

It is a super-2 number, since 2×21115225031² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21115224988 and 21115225006.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21115225039) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10557612515 + 10557612516.

It is an arithmetic number, because the mean of its divisors is an integer number (10557612516).

Almost surely, 2^21115225031 is an apocalyptic number.

21115225031 is a deficient number, since it is larger than the sum of its proper divisors (1).

21115225031 is an equidigital number, since it uses as much as digits as its factorization.

21115225031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 600, while the sum is 23.

Adding to 21115225031 its reverse (13052251112), we get a palindrome (34167476143).

The spelling of 21115225031 in words is "twenty-one billion, one hundred fifteen million, two hundred twenty-five thousand, thirty-one".