28321217001 has 64 divisors (see below), whose sum is σ = 52582256640. Its totient is φ = 14635883520.

The previous prime is 28321216999. The next prime is 28321217009. The reversal of 28321217001 is 10071212382.

28321217001 is a `hidden beast` number, since 283 + 212 + 170 + 0 + 1 = 666.

It is not a de Polignac number, because 28321217001 - 2¹ = 28321216999 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (28321217009) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 365956 + ... + 436538.

It is an arithmetic number, because the mean of its divisors is an integer number (821597760).

Almost surely, 2^28321217001 is an apocalyptic number.

28321217001 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

28321217001 is a deficient number, since it is larger than the sum of its proper divisors (24261039639).

28321217001 is a wasteful number, since it uses less digits than its factorization.

28321217001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70803 (or 70797 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 27.

Adding to 28321217001 its reverse (10071212382), we get a palindrome (38392429383).

The spelling of 28321217001 in words is "twenty-eight billion, three hundred twenty-one million, two hundred seventeen thousand, one".