511140021 has 24 divisors (see below), whose sum is σ = 793823040. Its totient is φ = 291699072.

The previous prime is 511140001. The next prime is 511140023. The reversal of 511140021 is 120041115.

It is a happy number.

It is not a de Polignac number, because 511140021 - 2¹⁵ = 511107253 is a prime.

It is a super-2 number, since 2×511140021² = 522528242135760882, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (511140023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 141840 + ... + 145398.

It is an arithmetic number, because the mean of its divisors is an integer number (33075960).

Almost surely, 2^511140021 is an apocalyptic number.

It is an amenable number.

511140021 is a deficient number, since it is larger than the sum of its proper divisors (282683019).

511140021 is a wasteful number, since it uses less digits than its factorization.

511140021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4553 (or 4546 counting only the distinct ones).

The product of its (nonzero) digits is 40, while the sum is 15.

The square root of 511140021 is about 22608.4059809620. The cubic root of 511140021 is about 799.5518432621.

Adding to 511140021 its reverse (120041115), we get a palindrome (631181136).

The spelling of 511140021 in words is "five hundred eleven million, one hundred forty thousand, twenty-one".