51115421 has 8 divisors (see below), whose sum is σ = 58465344. Its totient is φ = 43777440.

The previous prime is 51115409. The next prime is 51115423. The reversal of 51115421 is 12451115.

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

It is not a de Polignac number, because 51115421 - 2⁶ = 51115357 is a prime.

It is a super-2 number, since 2×51115421² = 5225572528014482, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 51115393 and 51115402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51115423) 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, 9926 + ... + 14168.

It is an arithmetic number, because the mean of its divisors is an integer number (7308168).

Almost surely, 2^51115421 is an apocalyptic number.

It is an amenable number.

51115421 is a deficient number, since it is larger than the sum of its proper divisors (7349923).

51115421 is a wasteful number, since it uses less digits than its factorization.

51115421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5971.

The product of its digits is 200, while the sum is 20.

The square root of 51115421 is about 7149.5049478967. The cubic root of 51115421 is about 371.1225247551.

Adding to 51115421 its reverse (12451115), we get a palindrome (63566536).

The spelling of 51115421 in words is "fifty-one million, one hundred fifteen thousand, four hundred twenty-one".