821117421867 has 8 divisors (see below), whose sum is σ = 1101151687824. Its totient is φ = 544247385248.

The previous prime is 821117421823. The next prime is 821117421877. The reversal of 821117421867 is 768124711128.

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 821117421867 - 2¹⁴ = 821117405483 is a prime.

It is not an unprimeable number, because it can be changed into a prime (821117421877) 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, 791056728 + ... + 791057765.

It is an arithmetic number, because the mean of its divisors is an integer number (137643960978).

Almost surely, 2^821117421867 is an apocalyptic number.

821117421867 is a deficient number, since it is larger than the sum of its proper divisors (280034265957).

821117421867 is a wasteful number, since it uses less digits than its factorization.

821117421867 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1582114669.

The product of its digits is 301056, while the sum is 48.

The spelling of 821117421867 in words is "eight hundred twenty-one billion, one hundred seventeen million, four hundred twenty-one thousand, eight hundred sixty-seven".