5251021 has 4 divisors (see below), whose sum is σ = 5255712. Its totient is φ = 5246332.

The previous prime is 5251019. The next prime is 5251027. The reversal of 5251021 is 1201525.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 5251021 - 2¹ = 5251019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 5250986 and 5251004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5251027) 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, 426 + ... + 3268.

It is an arithmetic number, because the mean of its divisors is an integer number (1313928).

Almost surely, 2^5251021 is an apocalyptic number.

It is an amenable number.

5251021 is a deficient number, since it is larger than the sum of its proper divisors (4691).

5251021 is a wasteful number, since it uses less digits than its factorization.

5251021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4690.

The product of its (nonzero) digits is 100, while the sum is 16.

The square root of 5251021 is about 2291.5106371126. The cubic root of 5251021 is about 173.8125982544.

Adding to 5251021 its reverse (1201525), we get a palindrome (6452546).

The spelling of 5251021 in words is "five million, two hundred fifty-one thousand, twenty-one".