55217212 has 6 divisors (see below), whose sum is σ = 96630128. Its totient is φ = 27608604.

The previous prime is 55217191. The next prime is 55217213. The reversal of 55217212 is 21271255.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55217213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6902148 + ... + 6902155.

Almost surely, 2^55217212 is an apocalyptic number.

It is an amenable number.

55217212 is a deficient number, since it is larger than the sum of its proper divisors (41412916).

55217212 is a wasteful number, since it uses less digits than its factorization.

55217212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13804307 (or 13804305 counting only the distinct ones).

The product of its digits is 1400, while the sum is 25.

The square root of 55217212 is about 7430.8284867840. The cubic root of 55217212 is about 380.7952229558.

Adding to 55217212 its reverse (21271255), we get a palindrome (76488467).

The spelling of 55217212 in words is "fifty-five million, two hundred seventeen thousand, two hundred twelve".