55212231 has 8 divisors (see below), whose sum is σ = 74548480. Its totient is φ = 36342072.

The previous prime is 55212217. The next prime is 55212239. The reversal of 55212231 is 13221255.

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-55212231 is a prime.

It is a super-2 number, since 2×55212231² = 6096780903994722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 55212198 and 55212207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55212239) 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, 116245 + ... + 116718.

It is an arithmetic number, because the mean of its divisors is an integer number (9318560).

Almost surely, 2^55212231 is an apocalyptic number.

55212231 is a deficient number, since it is larger than the sum of its proper divisors (19336249).

55212231 is a wasteful number, since it uses less digits than its factorization.

55212231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 233045.

The product of its digits is 600, while the sum is 21.

The square root of 55212231 is about 7430.4933214424. The cubic root of 55212231 is about 380.7837724317.

Adding to 55212231 its reverse (13221255), we get a palindrome (68433486).

The spelling of 55212231 in words is "fifty-five million, two hundred twelve thousand, two hundred thirty-one".