2516856421 has 8 divisors (see below), whose sum is σ = 2569636224. Its totient is φ = 2464272720.

The previous prime is 2516856383. The next prime is 2516856457. The reversal of 2516856421 is 1246586152.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2516856421 - 2¹⁵ = 2516823653 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 (2516856491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22945 + ... + 74566.

It is an arithmetic number, because the mean of its divisors is an integer number (321204528).

Almost surely, 2^2516856421 is an apocalyptic number.

It is an amenable number.

2516856421 is a deficient number, since it is larger than the sum of its proper divisors (52779803).

2516856421 is an equidigital number, since it uses as much as digits as its factorization.

2516856421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98051.

The product of its digits is 115200, while the sum is 40.

The square root of 2516856421 is about 50168.2810249664. The cubic root of 2516856421 is about 1360.2523358558.

The spelling of 2516856421 in words is "two billion, five hundred sixteen million, eight hundred fifty-six thousand, four hundred twenty-one".