5261612221 has 4 divisors (see below), whose sum is σ = 5538539200. Its totient is φ = 4984685244.

The previous prime is 5261612203. The next prime is 5261612231. The reversal of 5261612221 is 1222161625.

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 5261612221 - 2⁵ = 5261612189 is a prime.

It is a super-3 number, since 3×5261612221³ (a number of 30 digits) contains 333 as substring.

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 5261612221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5261612231) 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, 138463461 + ... + 138463498.

It is an arithmetic number, because the mean of its divisors is an integer number (1384634800).

Almost surely, 2^5261612221 is an apocalyptic number.

It is an amenable number.

5261612221 is a deficient number, since it is larger than the sum of its proper divisors (276926979).

5261612221 is a wasteful number, since it uses less digits than its factorization.

5261612221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 276926978.

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

The square root of 5261612221 is about 72536.9714076897. The cubic root of 5261612221 is about 1739.2937880338.

Adding to 5261612221 its reverse (1222161625), we get a palindrome (6483773846).

The spelling of 5261612221 in words is "five billion, two hundred sixty-one million, six hundred twelve thousand, two hundred twenty-one".