516021026421 has 4 divisors (see below), whose sum is σ = 688028035232. Its totient is φ = 344014017612.

The previous prime is 516021026407. The next prime is 516021026513. The reversal of 516021026421 is 124620120615.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 516021026421 - 2⁹ = 516021025909 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (516021026401) 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, 86003504401 + ... + 86003504406.

It is an arithmetic number, because the mean of its divisors is an integer number (172007008808).

Almost surely, 2^516021026421 is an apocalyptic number.

It is an amenable number.

516021026421 is a deficient number, since it is larger than the sum of its proper divisors (172007008811).

516021026421 is a wasteful number, since it uses less digits than its factorization.

516021026421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172007008810.

The product of its (nonzero) digits is 5760, while the sum is 30.

The spelling of 516021026421 in words is "five hundred sixteen billion, twenty-one million, twenty-six thousand, four hundred twenty-one".