6222021521 has 4 divisors (see below), whose sum is σ = 6238267392. Its totient is φ = 6205775652.

The previous prime is 6222021511. The next prime is 6222021527. The reversal of 6222021521 is 1251202226.

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.

It is a cyclic number.

It is not a de Polignac number, because 6222021521 - 2¹⁸ = 6221759377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6222021527) 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, 8122361 + ... + 8123126.

It is an arithmetic number, because the mean of its divisors is an integer number (1559566848).

Almost surely, 2^6222021521 is an apocalyptic number.

It is an amenable number.

6222021521 is a deficient number, since it is larger than the sum of its proper divisors (16245871).

6222021521 is a wasteful number, since it uses less digits than its factorization.

6222021521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16245870.

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 6222021521 is about 78879.7915882135. The cubic root of 6222021521 is about 1839.2630083467.

Adding to 6222021521 its reverse (1251202226), we get a palindrome (7473223747).

The spelling of 6222021521 in words is "six billion, two hundred twenty-two million, twenty-one thousand, five hundred twenty-one".