21525135031 has 2 divisors, whose sum is σ = 21525135032. Its totient is φ = 21525135030.

The previous prime is 21525135011. The next prime is 21525135173. The reversal of 21525135031 is 13053152512.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21525135031 - 2²⁹ = 20988264119 is a prime.

It is a super-2 number, since 2×21525135031² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21525135011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10762567515 + 10762567516.

It is an arithmetic number, because the mean of its divisors is an integer number (10762567516).

Almost surely, 2^21525135031 is an apocalyptic number.

21525135031 is a deficient number, since it is larger than the sum of its proper divisors (1).

21525135031 is an equidigital number, since it uses as much as digits as its factorization.

21525135031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4500, while the sum is 28.

Adding to 21525135031 its reverse (13053152512), we get a palindrome (34578287543).

The spelling of 21525135031 in words is "twenty-one billion, five hundred twenty-five million, one hundred thirty-five thousand, thirty-one".