51112421 has 8 divisors (see below), whose sum is σ = 54325080. Its totient is φ = 47922688.

The previous prime is 51112393. The next prime is 51112427. The reversal of 51112421 is 12421115.

It can be written as a sum of positive squares in 4 ways, for example, as 11296321 + 39816100 = 3361^2 + 6310^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 51112421 - 2¹⁰ = 51111397 is a prime.

It is a super-2 number, since 2×51112421² = 5224959160962482, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (17).

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 51112421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51112427) 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, 1016 + ... + 10161.

It is an arithmetic number, because the mean of its divisors is an integer number (6790635).

Almost surely, 2^51112421 is an apocalyptic number.

It is an amenable number.

51112421 is a deficient number, since it is larger than the sum of its proper divisors (3212659).

51112421 is a wasteful number, since it uses less digits than its factorization.

51112421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11463.

The product of its digits is 80, while the sum is 17.

The square root of 51112421 is about 7149.2951400820. The cubic root of 51112421 is about 371.1152641324.

Adding to 51112421 its reverse (12421115), we get a palindrome (63533536).

The spelling of 51112421 in words is "fifty-one million, one hundred twelve thousand, four hundred twenty-one".