551360021 has 8 divisors (see below), whose sum is σ = 560439000. Its totient is φ = 542322432.

The previous prime is 551360011. The next prime is 551360053. The reversal of 551360021 is 120063155.

It can be written as a sum of positive squares in 4 ways, for example, as 62331025 + 489028996 = 7895^2 + 22114^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-551360021 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 (551360011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17105 + ... + 37353.

It is an arithmetic number, because the mean of its divisors is an integer number (70054875).

Almost surely, 2^551360021 is an apocalyptic number.

It is an amenable number.

551360021 is a deficient number, since it is larger than the sum of its proper divisors (9078979).

551360021 is a wasteful number, since it uses less digits than its factorization.

551360021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20695.

The product of its (nonzero) digits is 900, while the sum is 23.

The square root of 551360021 is about 23481.0566414717. The cubic root of 551360021 is about 819.9960444981.

The spelling of 551360021 in words is "five hundred fifty-one million, three hundred sixty thousand, twenty-one".