55020321 has 12 divisors (see below), whose sum is σ = 79951872. Its totient is φ = 36459576.

The previous prime is 55020311. The next prime is 55020373. The reversal of 55020321 is 12302055.

It is a happy number.

It is not a de Polignac number, because 55020321 - 2⁷ = 55020193 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 55020294 and 55020303.

It is not an unprimeable number, because it can be changed into a prime (55020311) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16801 + ... + 19806.

It is an arithmetic number, because the mean of its divisors is an integer number (6662656).

Almost surely, 2^55020321 is an apocalyptic number.

It is an amenable number.

55020321 is a deficient number, since it is larger than the sum of its proper divisors (24931551).

55020321 is a wasteful number, since it uses less digits than its factorization.

55020321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36780 (or 36777 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 18.

The square root of 55020321 is about 7417.5684021113. The cubic root of 55020321 is about 380.3420765497.

Adding to 55020321 its reverse (12302055), we get a palindrome (67322376).

The spelling of 55020321 in words is "fifty-five million, twenty thousand, three hundred twenty-one".