21676801 has 2 divisors, whose sum is σ = 21676802. Its totient is φ = 21676800.

The previous prime is 21676799. The next prime is 21676807. The reversal of 21676801 is 10867612.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12215025 + 9461776 = 3495^2 + 3076^2 .

It is a cyclic number.

It is not a de Polignac number, because 21676801 - 2¹ = 21676799 is a prime.

Together with 21676799, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21676807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10838400 + 10838401.

It is an arithmetic number, because the mean of its divisors is an integer number (10838401).

Almost surely, 2^21676801 is an apocalyptic number.

It is an amenable number.

21676801 is a deficient number, since it is larger than the sum of its proper divisors (1).

21676801 is an equidigital number, since it uses as much as digits as its factorization.

21676801 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 21676801 is about 4655.8351560166. The cubic root of 21676801 is about 278.8250124222.

The spelling of 21676801 in words is "twenty-one million, six hundred seventy-six thousand, eight hundred one".