51744021 has 16 divisors (see below), whose sum is σ = 78988800. Its totient is φ = 29515248.

The previous prime is 51743999. The next prime is 51744029. The reversal of 51744021 is 12044715.

It is not a de Polignac number, because 51744021 - 2⁶ = 51743957 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 51743982 and 51744000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51744029) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11970 + ... + 15708.

It is an arithmetic number, because the mean of its divisors is an integer number (4936800).

Almost surely, 2^51744021 is an apocalyptic number.

It is an amenable number.

51744021 is a deficient number, since it is larger than the sum of its proper divisors (27244779).

51744021 is a wasteful number, since it uses less digits than its factorization.

51744021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4408.

The product of its (nonzero) digits is 1120, while the sum is 24.

The square root of 51744021 is about 7193.3317037378. The cubic root of 51744021 is about 372.6376435308.

Adding to 51744021 its reverse (12044715), we get a palindrome (63788736).

The spelling of 51744021 in words is "fifty-one million, seven hundred forty-four thousand, twenty-one".