525522021 has 16 divisors (see below), whose sum is σ = 726485760. Its totient is φ = 337507520.

The previous prime is 525521987. The next prime is 525522059. The reversal of 525522021 is 120225525.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-525522021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 525521982 and 525522000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (525522061) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33556 + ... + 46658.

It is an arithmetic number, because the mean of its divisors is an integer number (45405360).

Almost surely, 2^525522021 is an apocalyptic number.

It is an amenable number.

525522021 is a deficient number, since it is larger than the sum of its proper divisors (200963739).

525522021 is a wasteful number, since it uses less digits than its factorization.

525522021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13596.

The product of its (nonzero) digits is 2000, while the sum is 24.

The square root of 525522021 is about 22924.2670766156. The cubic root of 525522021 is about 806.9816133724.

Adding to 525522021 its reverse (120225525), we get a palindrome (645747546).

The spelling of 525522021 in words is "five hundred twenty-five million, five hundred twenty-two thousand, twenty-one".