55021142 has 8 divisors (see below), whose sum is σ = 90034632. Its totient is φ = 25009600.

The previous prime is 55021117. The next prime is 55021151. The reversal of 55021142 is 24112055.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1250459 + ... + 1250502.

It is an arithmetic number, because the mean of its divisors is an integer number (11254329).

Almost surely, 2^55021142 is an apocalyptic number.

55021142 is a deficient number, since it is larger than the sum of its proper divisors (35013490).

55021142 is a wasteful number, since it uses less digits than its factorization.

55021142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2500974.

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 55021142 is about 7417.6237434909. The cubic root of 55021142 is about 380.3439683313.

Adding to 55021142 its reverse (24112055), we get a palindrome (79133197).

It can be divided in two parts, 550 and 21142, that multiplied together give a square (11628100 = 3410²).

The spelling of 55021142 in words is "fifty-five million, twenty-one thousand, one hundred forty-two".