551342421 has 12 divisors (see below), whose sum is σ = 910152672. Its totient is φ = 315052776.

The previous prime is 551342381. The next prime is 551342443. The reversal of 551342421 is 124243155.

It is not a de Polignac number, because 551342421 - 2¹⁰ = 551341397 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (551341421) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4375671 + ... + 4375796.

It is an arithmetic number, because the mean of its divisors is an integer number (75846056).

Almost surely, 2^551342421 is an apocalyptic number.

It is an amenable number.

551342421 is a deficient number, since it is larger than the sum of its proper divisors (358810251).

551342421 is a wasteful number, since it uses less digits than its factorization.

551342421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8751480 (or 8751477 counting only the distinct ones).

The product of its digits is 4800, while the sum is 27.

The square root of 551342421 is about 23480.6818682933. The cubic root of 551342421 is about 819.9873193558.

Adding to 551342421 its reverse (124243155), we get a palindrome (675585576).

The spelling of 551342421 in words is "five hundred fifty-one million, three hundred forty-two thousand, four hundred twenty-one".