51420212 has 6 divisors (see below), whose sum is σ = 89985378. Its totient is φ = 25710104.

The previous prime is 51420199. The next prime is 51420233. The reversal of 51420212 is 21202415.

It can be written as a sum of positive squares in only one way, i.e., 38987536 + 12432676 = 6244^2 + 3526^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6427523 + ... + 6427530.

It is an arithmetic number, because the mean of its divisors is an integer number (14997563).

Almost surely, 2^51420212 is an apocalyptic number.

It is an amenable number.

51420212 is a deficient number, since it is larger than the sum of its proper divisors (38565166).

51420212 is a wasteful number, since it uses less digits than its factorization.

51420212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12855057 (or 12855055 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 17.

The square root of 51420212 is about 7170.7887990095. The cubic root of 51420212 is about 371.8587065055.

Adding to 51420212 its reverse (21202415), we get a palindrome (72622627).

The spelling of 51420212 in words is "fifty-one million, four hundred twenty thousand, two hundred twelve".