553220021 has 4 divisors (see below), whose sum is σ = 553321344. Its totient is φ = 553118700.

The previous prime is 553219993. The next prime is 553220027. The reversal of 553220021 is 120022355.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 120022355 = 5 ⋅24004471.

It is a cyclic number.

It is not a de Polignac number, because 553220021 - 2⁶ = 553219957 is a prime.

It is a super-3 number, since 3×553220021³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 553219975 and 553220002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (553220027) 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, 41975 + ... + 53556.

It is an arithmetic number, because the mean of its divisors is an integer number (138330336).

Almost surely, 2^553220021 is an apocalyptic number.

It is an amenable number.

553220021 is a deficient number, since it is larger than the sum of its proper divisors (101323).

553220021 is an equidigital number, since it uses as much as digits as its factorization.

553220021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101322.

The product of its (nonzero) digits is 600, while the sum is 20.

The square root of 553220021 is about 23520.6296897001. The cubic root of 553220021 is about 820.9170886584.

Adding to 553220021 its reverse (120022355), we get a palindrome (673242376).

The spelling of 553220021 in words is "five hundred fifty-three million, two hundred twenty thousand, twenty-one".