5042521021 has 4 divisors (see below), whose sum is σ = 5042975392. Its totient is φ = 5042066652.

The previous prime is 5042521013. The next prime is 5042521123. The reversal of 5042521021 is 1201252405.

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 an emirpimes, since its reverse is a distinct semiprime: 1201252405 = 5 ⋅240250481.

It is a cyclic number.

It is not a de Polignac number, because 5042521021 - 2³ = 5042521013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 5042520983 and 5042521001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5042521621) 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, 210111 + ... + 232876.

It is an arithmetic number, because the mean of its divisors is an integer number (1260743848).

Almost surely, 2^5042521021 is an apocalyptic number.

It is an amenable number.

5042521021 is a deficient number, since it is larger than the sum of its proper divisors (454371).

5042521021 is a wasteful number, since it uses less digits than its factorization.

5042521021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 454370.

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

The square root of 5042521021 is about 71010.7106076259. The cubic root of 5042521021 is about 1714.8095985501.

Adding to 5042521021 its reverse (1201252405), we get a palindrome (6243773426).

The spelling of 5042521021 in words is "five billion, forty-two million, five hundred twenty-one thousand, twenty-one".