51234421 has 4 divisors (see below), whose sum is σ = 58553632. Its totient is φ = 43915212.

The previous prime is 51234389. The next prime is 51234433. The reversal of 51234421 is 12443215.

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.

It is a cyclic number.

It is not a de Polignac number, because 51234421 - 2⁵ = 51234389 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51234392 and 51234401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51234121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3659595 + ... + 3659608.

It is an arithmetic number, because the mean of its divisors is an integer number (14638408).

Almost surely, 2^51234421 is an apocalyptic number.

It is an amenable number.

51234421 is a deficient number, since it is larger than the sum of its proper divisors (7319211).

51234421 is an equidigital number, since it uses as much as digits as its factorization.

51234421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7319210.

The product of its digits is 960, while the sum is 22.

The square root of 51234421 is about 7157.8223643787. The cubic root of 51234421 is about 371.4103006158.

Adding to 51234421 its reverse (12443215), we get a palindrome (63677636).

The spelling of 51234421 in words is "fifty-one million, two hundred thirty-four thousand, four hundred twenty-one".