855255421 has 4 divisors (see below), whose sum is σ = 867301344. Its totient is φ = 843209500.

The previous prime is 855255409. The next prime is 855255433. The reversal of 855255421 is 124552558.

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 an interprime number because it is at equal distance from previous prime (855255409) and next prime (855255433).

It is a cyclic number.

It is not a de Polignac number, because 855255421 - 2⁵ = 855255389 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 (855255461) 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, 6022855 + ... + 6022996.

It is an arithmetic number, because the mean of its divisors is an integer number (216825336).

Almost surely, 2^855255421 is an apocalyptic number.

It is an amenable number.

855255421 is a deficient number, since it is larger than the sum of its proper divisors (12045923).

855255421 is a wasteful number, since it uses less digits than its factorization.

855255421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12045922.

The product of its digits is 80000, while the sum is 37.

The square root of 855255421 is about 29244.7503152275. The cubic root of 855255421 is about 949.2164993323.

The spelling of 855255421 in words is "eight hundred fifty-five million, two hundred fifty-five thousand, four hundred twenty-one".