51220213 has 8 divisors (see below), whose sum is σ = 56550816. Its totient is φ = 46002000.

The previous prime is 51220199. The next prime is 51220223. The reversal of 51220213 is 31202215.

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

It is a de Polignac number, because none of the positive numbers 2^k-51220213 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 (51220223) 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, 27138 + ... + 28963.

It is an arithmetic number, because the mean of its divisors is an integer number (7068852).

Almost surely, 2^51220213 is an apocalyptic number.

It is an amenable number.

51220213 is a deficient number, since it is larger than the sum of its proper divisors (5330603).

51220213 is a wasteful number, since it uses less digits than its factorization.

51220213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56195.

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 51220213 is about 7156.8298149390. The cubic root of 51220213 is about 371.3759650700.

Adding to 51220213 its reverse (31202215), we get a palindrome (82422428).

It can be divided in two parts, 512202 and 13, that added together give a palindrome (512215).

The spelling of 51220213 in words is "fifty-one million, two hundred twenty thousand, two hundred thirteen".