55212215 has 8 divisors (see below), whose sum is σ = 67795728. Its totient is φ = 43142400.

The previous prime is 55212203. The next prime is 55212217. The reversal of 55212215 is 51221255.

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

It is not a de Polignac number, because 55212215 - 2¹⁴ = 55195831 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 (55212217) 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, 128186 + ... + 128615.

It is an arithmetic number, because the mean of its divisors is an integer number (8474466).

Almost surely, 2^55212215 is an apocalyptic number.

55212215 is a deficient number, since it is larger than the sum of its proper divisors (12583513).

55212215 is a wasteful number, since it uses less digits than its factorization.

55212215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 256849.

The product of its digits is 1000, while the sum is 23.

The square root of 55212215 is about 7430.4922447978. The cubic root of 55212215 is about 380.7837356491.

The spelling of 55212215 in words is "fifty-five million, two hundred twelve thousand, two hundred fifteen".