55420213 has 4 divisors (see below), whose sum is σ = 56179468. Its totient is φ = 54660960.

The previous prime is 55420201. The next prime is 55420229. The reversal of 55420213 is 31202455.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31202455 = 5 ⋅6240491.

It can be written as a sum of positive squares in 2 ways, for example, as 12687844 + 42732369 = 3562^2 + 6537^2 .

It is a cyclic number.

It is not a de Polignac number, because 55420213 - 2⁵ = 55420181 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55420913) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 379518 + ... + 379663.

It is an arithmetic number, because the mean of its divisors is an integer number (14044867).

Almost surely, 2^55420213 is an apocalyptic number.

It is an amenable number.

55420213 is a deficient number, since it is larger than the sum of its proper divisors (759255).

55420213 is an equidigital number, since it uses as much as digits as its factorization.

55420213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 759254.

The product of its (nonzero) digits is 1200, while the sum is 22.

The square root of 55420213 is about 7444.4753340984. The cubic root of 55420213 is about 381.2613051203.

Adding to 55420213 its reverse (31202455), we get a palindrome (86622668).

The spelling of 55420213 in words is "fifty-five million, four hundred twenty thousand, two hundred thirteen".