821315174401 has 8 divisors (see below), whose sum is σ = 837277779744. Its totient is φ = 805497027360.

The previous prime is 821315174387. The next prime is 821315174411. The reversal of 821315174401 is 104471513128.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-821315174401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (821315174411) 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, 36103095 + ... + 36125836.

It is an arithmetic number, because the mean of its divisors is an integer number (104659722468).

Almost surely, 2^821315174401 is an apocalyptic number.

It is an amenable number.

821315174401 is a deficient number, since it is larger than the sum of its proper divisors (15962605343).

821315174401 is a wasteful number, since it uses less digits than its factorization.

821315174401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72229151.

The product of its (nonzero) digits is 26880, while the sum is 37.

Adding to 821315174401 its reverse (104471513128), we get a palindrome (925786687529).

The spelling of 821315174401 in words is "eight hundred twenty-one billion, three hundred fifteen million, one hundred seventy-four thousand, four hundred one".