511400021 has 8 divisors (see below), whose sum is σ = 568417824. Its totient is φ = 456136720.

The previous prime is 511399981. The next prime is 511400041. The reversal of 511400021 is 120004115.

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-511400021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 511399969 and 511400005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (511400041) 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 7 ways as a sum of consecutive naturals, for example, 438011 + ... + 439176.

It is an arithmetic number, because the mean of its divisors is an integer number (71052228).

Almost surely, 2^511400021 is an apocalyptic number.

It is an amenable number.

511400021 is a deficient number, since it is larger than the sum of its proper divisors (57017803).

511400021 is a wasteful number, since it uses less digits than its factorization.

511400021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 877251.

The product of its (nonzero) digits is 40, while the sum is 14.

The square root of 511400021 is about 22614.1553236021. The cubic root of 511400021 is about 799.6873887962.

Adding to 511400021 its reverse (120004115), we get a palindrome (631404136).

The spelling of 511400021 in words is "five hundred eleven million, four hundred thousand, twenty-one".