51126221 has 8 divisors (see below), whose sum is σ = 52731000. Its totient is φ = 49538560.

The previous prime is 51126209. The next prime is 51126233. The reversal of 51126221 is 12262115.

It is an interprime number because it is at equal distance from previous prime (51126209) and next prime (51126233).

It can be written as a sum of positive squares in 4 ways, for example, as 3721 + 51122500 = 61^2 + 7150^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51126221 is a prime.

It is a super-2 number, since 2×51126221² = 5227780947481682, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51126193 and 51126202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51126241) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1925 + ... + 10293.

It is an arithmetic number, because the mean of its divisors is an integer number (6591375).

Almost surely, 2^51126221 is an apocalyptic number.

It is an amenable number.

51126221 is a deficient number, since it is larger than the sum of its proper divisors (1604779).

51126221 is a wasteful number, since it uses less digits than its factorization.

51126221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8559.

The product of its digits is 240, while the sum is 20.

The square root of 51126221 is about 7150.2602050555. The cubic root of 51126221 is about 371.1486606448.

Adding to 51126221 its reverse (12262115), we get a palindrome (63388336).

The spelling of 51126221 in words is "fifty-one million, one hundred twenty-six thousand, two hundred twenty-one".