21676351 has 2 divisors, whose sum is σ = 21676352. Its totient is φ = 21676350.

The previous prime is 21676337. The next prime is 21676367. The reversal of 21676351 is 15367612.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21676351 - 2¹³ = 21668159 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21676301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10838175 + 10838176.

It is an arithmetic number, because the mean of its divisors is an integer number (10838176).

Almost surely, 2^21676351 is an apocalyptic number.

21676351 is a deficient number, since it is larger than the sum of its proper divisors (1).

21676351 is an equidigital number, since it uses as much as digits as its factorization.

21676351 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7560, while the sum is 31.

The square root of 21676351 is about 4655.7868293125. The cubic root of 21676351 is about 278.8230829843.

It can be divided in two parts, 216 and 76351, that added together give a palindrome (76567).

The spelling of 21676351 in words is "twenty-one million, six hundred seventy-six thousand, three hundred fifty-one".