55213140 has 24 divisors (see below), whose sum is σ = 154596960. Its totient is φ = 14723488.

The previous prime is 55213111. The next prime is 55213141. The reversal of 55213140 is 4131255.

55213140 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55213141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 460050 + ... + 460169.

It is an arithmetic number, because the mean of its divisors is an integer number (6441540).

Almost surely, 2^55213140 is an apocalyptic number.

It is an amenable number.

55213140 is an abundant number, since it is smaller than the sum of its proper divisors (99383820).

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

55213140 is a wasteful number, since it uses less digits than its factorization.

55213140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 920231 (or 920229 counting only the distinct ones).

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

The square root of 55213140 is about 7430.5544880581. The cubic root of 55213140 is about 380.7858621290.

Adding to 55213140 its reverse (4131255), we get a palindrome (59344395).

The spelling of 55213140 in words is "fifty-five million, two hundred thirteen thousand, one hundred forty".