6221625121 has 4 divisors (see below), whose sum is σ = 6225793812. Its totient is φ = 6217456432.

The previous prime is 6221625089. The next prime is 6221625131. The reversal of 6221625121 is 1215261226.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4530770721 + 1690854400 = 67311^2 + 41120^2 .

It is a cyclic number.

It is not a de Polignac number, because 6221625121 - 2⁵ = 6221625089 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6221625121.

It is not an unprimeable number, because it can be changed into a prime (6221625131) 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, 2082106 + ... + 2085091.

It is an arithmetic number, because the mean of its divisors is an integer number (1556448453).

Almost surely, 2^6221625121 is an apocalyptic number.

It is an amenable number.

6221625121 is a deficient number, since it is larger than the sum of its proper divisors (4168691).

6221625121 is a wasteful number, since it uses less digits than its factorization.

6221625121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4168690.

The product of its digits is 2880, while the sum is 28.

The square root of 6221625121 is about 78877.2788640683. The cubic root of 6221625121 is about 1839.2239481935.

Adding to 6221625121 its reverse (1215261226), we get a palindrome (7436886347).

The spelling of 6221625121 in words is "six billion, two hundred twenty-one million, six hundred twenty-five thousand, one hundred twenty-one".