525007021 has 36 divisors (see below), whose sum is σ = 681046716. Its totient is φ = 403159680.

The previous prime is 525007019. The next prime is 525007027. The reversal of 525007021 is 120700525.

It can be written as a sum of positive squares in 2 ways, for example, as 133402500 + 391604521 = 11550^2 + 19789^2 .

It is not a de Polignac number, because 525007021 - 2¹ = 525007019 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 525006983 and 525007001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (525007027) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 432211 + ... + 433423.

Almost surely, 2^525007021 is an apocalyptic number.

It is an amenable number.

525007021 is a deficient number, since it is larger than the sum of its proper divisors (156039695).

525007021 is a wasteful number, since it uses less digits than its factorization.

525007021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1322 (or 1304 counting only the distinct ones).

The product of its (nonzero) digits is 700, while the sum is 22.

The square root of 525007021 is about 22913.0316850477. The cubic root of 525007021 is about 806.7179191494.

Adding to 525007021 its reverse (120700525), we get a palindrome (645707546).

The spelling of 525007021 in words is "five hundred twenty-five million, seven thousand, twenty-one".