51373221 has 8 divisors (see below), whose sum is σ = 68558784. Its totient is φ = 34218240.

The previous prime is 51373213. The next prime is 51373253. The reversal of 51373221 is 12237315.

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

It is not a de Polignac number, because 51373221 - 2³ = 51373213 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 51373191 and 51373200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51373921) 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, 3385 + ... + 10686.

It is an arithmetic number, because the mean of its divisors is an integer number (8569848).

Almost surely, 2^51373221 is an apocalyptic number.

It is an amenable number.

51373221 is a deficient number, since it is larger than the sum of its proper divisors (17185563).

51373221 is a wasteful number, since it uses less digits than its factorization.

51373221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15291.

The product of its digits is 1260, while the sum is 24.

The square root of 51373221 is about 7167.5114928405. The cubic root of 51373221 is about 371.7453960811.

The spelling of 51373221 in words is "fifty-one million, three hundred seventy-three thousand, two hundred twenty-one".