21676413 has 32 divisors (see below), whose sum is σ = 33247872. Its totient is φ = 12441600.

The previous prime is 21676387. The next prime is 21676469. The reversal of 21676413 is 31467612.

It is not a de Polignac number, because 21676413 - 2¹³ = 21668221 is a prime.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21676483) 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 in 31 ways as a sum of consecutive naturals, for example, 49845 + ... + 50277.

It is an arithmetic number, because the mean of its divisors is an integer number (1038996).

Almost surely, 2^21676413 is an apocalyptic number.

It is an amenable number.

21676413 is a deficient number, since it is larger than the sum of its proper divisors (11571459).

21676413 is a wasteful number, since it uses less digits than its factorization.

21676413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 525.

The product of its digits is 6048, while the sum is 30.

The square root of 21676413 is about 4655.7934876882. The cubic root of 21676413 is about 278.8233488196.

The spelling of 21676413 in words is "twenty-one million, six hundred seventy-six thousand, four hundred thirteen".