817214685421 has 8 divisors (see below), whose sum is σ = 819217078904. Its totient is φ = 815212823040.

The previous prime is 817214685347. The next prime is 817214685533. The reversal of 817214685421 is 124586412718.

817214685421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 179475086025 + 637739599396 = 423645^2 + 798586^2 .

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 817214685421 - 2¹⁹ = 817214161133 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 (817214685821) 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, 3041095 + ... + 3298891.

It is an arithmetic number, because the mean of its divisors is an integer number (102402134863).

Almost surely, 2^817214685421 is an apocalyptic number.

It is an amenable number.

817214685421 is a deficient number, since it is larger than the sum of its proper divisors (2002393483).

817214685421 is a wasteful number, since it uses less digits than its factorization.

817214685421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 265551.

The product of its digits is 860160, while the sum is 49.

The spelling of 817214685421 in words is "eight hundred seventeen billion, two hundred fourteen million, six hundred eighty-five thousand, four hundred twenty-one".