51822421 has 16 divisors (see below), whose sum is σ = 61636608. Its totient is φ = 42634800.

The previous prime is 51822413. The next prime is 51822431. The reversal of 51822421 is 12422815.

It is a cyclic number.

It is not a de Polignac number, because 51822421 - 2³ = 51822413 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51822431) 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, 27516 + ... + 29338.

It is an arithmetic number, because the mean of its divisors is an integer number (3852288).

Almost surely, 2^51822421 is an apocalyptic number.

It is an amenable number.

51822421 is a deficient number, since it is larger than the sum of its proper divisors (9814187).

51822421 is a wasteful number, since it uses less digits than its factorization.

51822421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1992.

The product of its digits is 1280, while the sum is 25.

The square root of 51822421 is about 7198.7791326030. The cubic root of 51822421 is about 372.8257493136.

The spelling of 51822421 in words is "fifty-one million, eight hundred twenty-two thousand, four hundred twenty-one".