511104254200021 has 4 divisors (see below), whose sum is σ = 541169210329452. Its totient is φ = 481039298070592.

The previous prime is 511104254200013. The next prime is 511104254200027. The reversal of 511104254200021 is 120002452401115.

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 161765202503025 + 349339051696996 = 12718695^2 + 18690614^2 .

It is a cyclic number.

It is not a de Polignac number, because 511104254200021 - 2³ = 511104254200013 is a prime.

It is a super-2 number, since 2×511104254200021² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (511104254200027) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15032478064690 + ... + 15032478064723.

It is an arithmetic number, because the mean of its divisors is an integer number (135292302582363).

Almost surely, 2^{511104254200021} is an apocalyptic number.

It is an amenable number.

511104254200021 is a deficient number, since it is larger than the sum of its proper divisors (30064956129431).

511104254200021 is a wasteful number, since it uses less digits than its factorization.

511104254200021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30064956129430.

The product of its (nonzero) digits is 3200, while the sum is 28.

The spelling of 511104254200021 in words is "five hundred eleven trillion, one hundred four billion, two hundred fifty-four million, two hundred thousand, twenty-one".