51088421 has 4 divisors (see below), whose sum is σ = 51123744. Its totient is φ = 51053100.

The previous prime is 51088391. The next prime is 51088423. The reversal of 51088421 is 12488015.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12488015 = 5 ⋅2497603.

It is a cyclic number.

It is not a de Polignac number, because 51088421 - 2⁶ = 51088357 is a prime.

It is a super-2 number, since 2×51088421² = 5220053520546482, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51088423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15395 + ... + 18416.

It is an arithmetic number, because the mean of its divisors is an integer number (12780936).

Almost surely, 2^51088421 is an apocalyptic number.

It is an amenable number.

51088421 is a deficient number, since it is larger than the sum of its proper divisors (35323).

51088421 is a wasteful number, since it uses less digits than its factorization.

51088421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35322.

The product of its (nonzero) digits is 2560, while the sum is 29.

The square root of 51088421 is about 7147.6164558544. The cubic root of 51088421 is about 371.0571689206.

The spelling of 51088421 in words is "fifty-one million, eighty-eight thousand, four hundred twenty-one".