525210421 has 4 divisors (see below), whose sum is σ = 525266092. Its totient is φ = 525154752.

The previous prime is 525210391. The next prime is 525210437. The reversal of 525210421 is 124012525.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 215943025 + 309267396 = 14695^2 + 17586^2 .

It is a cyclic number.

It is not a de Polignac number, because 525210421 - 2¹³ = 525202229 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 525210392 and 525210401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (525210481) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9780 + ... + 33853.

It is an arithmetic number, because the mean of its divisors is an integer number (131316523).

Almost surely, 2^525210421 is an apocalyptic number.

It is an amenable number.

525210421 is a deficient number, since it is larger than the sum of its proper divisors (55671).

525210421 is a wasteful number, since it uses less digits than its factorization.

525210421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55670.

The product of its (nonzero) digits is 800, while the sum is 22.

The square root of 525210421 is about 22917.4697774427. The cubic root of 525210421 is about 806.8220861621.

Adding to 525210421 its reverse (124012525), we get a palindrome (649222946).

The spelling of 525210421 in words is "five hundred twenty-five million, two hundred ten thousand, four hundred twenty-one".