21130527 has 32 divisors (see below), whose sum is σ = 32901120. Its totient is φ = 11927520.

The previous prime is 21130511. The next prime is 21130573. The reversal of 21130527 is 72503112.

It is not a de Polignac number, because 21130527 - 2⁴ = 21130511 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21130597) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 41758 + ... + 42260.

It is an arithmetic number, because the mean of its divisors is an integer number (1028160).

Almost surely, 2^21130527 is an apocalyptic number.

21130527 is a deficient number, since it is larger than the sum of its proper divisors (11770593).

21130527 is a wasteful number, since it uses less digits than its factorization.

21130527 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 603.

The product of its (nonzero) digits is 420, while the sum is 21.

The square root of 21130527 is about 4596.7952967258. The cubic root of 21130527 is about 276.4628470933.

Adding to 21130527 its reverse (72503112), we get a palindrome (93633639).

The spelling of 21130527 in words is "twenty-one million, one hundred thirty thousand, five hundred twenty-seven".