51550212 has 48 divisors (see below), whose sum is σ = 137984000. Its totient is φ = 14673312.

The previous prime is 51550207. The next prime is 51550229. The reversal of 51550212 is 21205515.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24789 + ... + 26787.

Almost surely, 2^51550212 is an apocalyptic number.

It is an amenable number.

51550212 is an abundant number, since it is smaller than the sum of its proper divisors (86433788).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51550212 is a wasteful number, since it uses less digits than its factorization.

51550212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2320 (or 2318 counting only the distinct ones).

The product of its (nonzero) digits is 500, while the sum is 21.

The square root of 51550212 is about 7179.8476306952. The cubic root of 51550212 is about 372.1718191135.

Adding to 51550212 its reverse (21205515), we get a palindrome (72755727).

The spelling of 51550212 in words is "fifty-one million, five hundred fifty thousand, two hundred twelve".