552100021 has 4 divisors (see below), whose sum is σ = 602290944. Its totient is φ = 501909100.

The previous prime is 552100013. The next prime is 552100039. The reversal of 552100021 is 120001255.

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.

It is not a de Polignac number, because 552100021 - 2³ = 552100013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 552099968 and 552100004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (552100001) 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, 25095445 + ... + 25095466.

It is an arithmetic number, because the mean of its divisors is an integer number (150572736).

Almost surely, 2^552100021 is an apocalyptic number.

It is an amenable number.

552100021 is a deficient number, since it is larger than the sum of its proper divisors (50190923).

552100021 is a wasteful number, since it uses less digits than its factorization.

552100021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50190922.

The product of its (nonzero) digits is 100, while the sum is 16.

The square root of 552100021 is about 23496.8087407631. The cubic root of 552100021 is about 820.3627291712.

Adding to 552100021 its reverse (120001255), we get a palindrome (672101276).

The spelling of 552100021 in words is "five hundred fifty-two million, one hundred thousand, twenty-one".