551120421 has 8 divisors (see below), whose sum is σ = 746873824. Its totient is φ = 361390320.

The previous prime is 551120413. The next prime is 551120497. The reversal of 551120421 is 124021155.

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

It is not a de Polignac number, because 551120421 - 2³ = 551120413 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 (551120021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1505611 + ... + 1505976.

It is an arithmetic number, because the mean of its divisors is an integer number (93359228).

Almost surely, 2^551120421 is an apocalyptic number.

It is an amenable number.

551120421 is a deficient number, since it is larger than the sum of its proper divisors (195753403).

551120421 is a wasteful number, since it uses less digits than its factorization.

551120421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3011651.

The product of its (nonzero) digits is 400, while the sum is 21.

The square root of 551120421 is about 23475.9541020168. The cubic root of 551120421 is about 819.8772476374.

Adding to 551120421 its reverse (124021155), we get a palindrome (675141576).

The spelling of 551120421 in words is "five hundred fifty-one million, one hundred twenty thousand, four hundred twenty-one".