55302021 has 20 divisors (see below), whose sum is σ = 82846764. Its totient is φ = 36763200.

The previous prime is 55302011. The next prime is 55302053. The reversal of 55302021 is 12020355.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 20657025 + 34644996 = 4545^2 + 5886^2 .

It is not a de Polignac number, because 55302021 - 2⁷ = 55301893 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 55301985 and 55302003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55302011) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 36601 + ... + 38081.

Almost surely, 2^55302021 is an apocalyptic number.

It is an amenable number.

55302021 is a deficient number, since it is larger than the sum of its proper divisors (27544743).

55302021 is a wasteful number, since it uses less digits than its factorization.

55302021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1954 (or 1945 counting only the distinct ones).

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

The square root of 55302021 is about 7436.5328614886. The cubic root of 55302021 is about 380.9900797219.

Adding to 55302021 its reverse (12020355), we get a palindrome (67322376).

The spelling of 55302021 in words is "fifty-five million, three hundred two thousand, twenty-one".