80100821 has 8 divisors (see below), whose sum is σ = 84988440. Its totient is φ = 75232768.

The previous prime is 80100803. The next prime is 80100829. The reversal of 80100821 is 12800108.

It can be written as a sum of positive squares in 4 ways, for example, as 14668900 + 65431921 = 3830^2 + 8089^2 .

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 80100821 - 2¹⁴ = 80084437 is a prime.

It is a super-2 number, since 2×80100821² = 12832283049748082, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 80100793 and 80100802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80100829) 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, 4025 + ... + 13281.

It is an arithmetic number, because the mean of its divisors is an integer number (10623555).

Almost surely, 2^80100821 is an apocalyptic number.

It is an amenable number.

80100821 is a deficient number, since it is larger than the sum of its proper divisors (4887619).

80100821 is a wasteful number, since it uses less digits than its factorization.

80100821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9783.

The product of its (nonzero) digits is 128, while the sum is 20.

The square root of 80100821 is about 8949.9062006258. The cubic root of 80100821 is about 431.0678722360.

Adding to 80100821 its reverse (12800108), we get a palindrome (92900929).

The spelling of 80100821 in words is "eighty million, one hundred thousand, eight hundred twenty-one".