51299421 has 16 divisors (see below), whose sum is σ = 73508544. Its totient is φ = 31705344.

The previous prime is 51299383. The next prime is 51299429. The reversal of 51299421 is 12499215.

51299421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 51299421 - 2⁶ = 51299357 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51299429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4090 + ... + 10923.

It is an arithmetic number, because the mean of its divisors is an integer number (4594284).

Almost surely, 2^51299421 is an apocalyptic number.

51299421 is a gapful number since it is divisible by the number (51) formed by its first and last digit.

It is an amenable number.

51299421 is a deficient number, since it is larger than the sum of its proper divisors (22209123).

51299421 is a wasteful number, since it uses less digits than its factorization.

51299421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15100.

The product of its digits is 6480, while the sum is 33.

The square root of 51299421 is about 7162.3614122718. The cubic root of 51299421 is about 371.5673009743.

The spelling of 51299421 in words is "fifty-one million, two hundred ninety-nine thousand, four hundred twenty-one".