855081821 has 8 divisors (see below), whose sum is σ = 934279488. Its totient is φ = 776128000.

The previous prime is 855081811. The next prime is 855081839. The reversal of 855081821 is 128180558.

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 855081821 - 2¹⁰ = 855080797 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 (855081811) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 53585 + ... + 67686.

It is an arithmetic number, because the mean of its divisors is an integer number (116784936).

Almost surely, 2^855081821 is an apocalyptic number.

It is an amenable number.

855081821 is a deficient number, since it is larger than the sum of its proper divisors (79197667).

855081821 is a wasteful number, since it uses less digits than its factorization.

855081821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121923.

The product of its (nonzero) digits is 25600, while the sum is 38.

The square root of 855081821 is about 29241.7821105349. The cubic root of 855081821 is about 949.1522709038.

The spelling of 855081821 in words is "eight hundred fifty-five million, eighty-one thousand, eight hundred twenty-one".