55122012 has 48 divisors (see below), whose sum is σ = 155904000. Its totient is φ = 16703280.

The previous prime is 55121993. The next prime is 55122019. The reversal of 55122012 is 21022155.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55122019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22012 + ... + 24387.

It is an arithmetic number, because the mean of its divisors is an integer number (3248000).

Almost surely, 2^55122012 is an apocalyptic number.

It is an amenable number.

55122012 is an abundant number, since it is smaller than the sum of its proper divisors (100781988).

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

55122012 is a wasteful number, since it uses less digits than its factorization.

55122012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46423 (or 46415 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 18.

The square root of 55122012 is about 7424.4199773450. The cubic root of 55122012 is about 380.5762540404.

Adding to 55122012 its reverse (21022155), we get a palindrome (76144167).

The spelling of 55122012 in words is "fifty-five million, one hundred twenty-two thousand, twelve".