511043203421 has 4 divisors (see below), whose sum is σ = 511057723644. Its totient is φ = 511028683200.

The previous prime is 511043203417. The next prime is 511043203439. The reversal of 511043203421 is 124302340115.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 49715620900 + 461327582521 = 222970^2 + 679211^2 .

It is a cyclic number.

It is not a de Polignac number, because 511043203421 - 2² = 511043203417 is a prime.

It is a super-2 number, since 2×511043203421² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (511043202421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7207190 + ... + 7277751.

It is an arithmetic number, because the mean of its divisors is an integer number (127764430911).

Almost surely, 2^511043203421 is an apocalyptic number.

It is an amenable number.

511043203421 is a deficient number, since it is larger than the sum of its proper divisors (14520223).

511043203421 is a wasteful number, since it uses less digits than its factorization.

511043203421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14520222.

The product of its (nonzero) digits is 2880, while the sum is 26.

Adding to 511043203421 its reverse (124302340115), we get a palindrome (635345543536).

The spelling of 511043203421 in words is "five hundred eleven billion, forty-three million, two hundred three thousand, four hundred twenty-one".