51140221 has 8 divisors (see below), whose sum is σ = 56332224. Its totient is φ = 46038720.

The previous prime is 51140213. The next prime is 51140231. The reversal of 51140221 is 12204115.

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

It is a cyclic number.

It is not a de Polignac number, because 51140221 - 2³ = 51140213 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51140195 and 51140204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51140231) 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, 21436 + ... + 23701.

It is an arithmetic number, because the mean of its divisors is an integer number (7041528).

Almost surely, 2^51140221 is an apocalyptic number.

It is an amenable number.

51140221 is a deficient number, since it is larger than the sum of its proper divisors (5192003).

51140221 is a wasteful number, since it uses less digits than its factorization.

51140221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45251.

The product of its (nonzero) digits is 80, while the sum is 16.

The square root of 51140221 is about 7151.2391233967. The cubic root of 51140221 is about 371.1825350243.

Adding to 51140221 its reverse (12204115), we get a palindrome (63344336).

The spelling of 51140221 in words is "fifty-one million, one hundred forty thousand, two hundred twenty-one".