21413677 has 2 divisors, whose sum is σ = 21413678. Its totient is φ = 21413676.

The previous prime is 21413647. The next prime is 21413719. The reversal of 21413677 is 77631412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12257001 + 9156676 = 3501^2 + 3026^2 .

It is a cyclic number.

It is not a de Polignac number, because 21413677 - 2⁷ = 21413549 is a prime.

It is equal to p_1354468 and since 21413677 and 1354468 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21413617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10706838 + 10706839.

It is an arithmetic number, because the mean of its divisors is an integer number (10706839).

Almost surely, 2^21413677 is an apocalyptic number.

It is an amenable number.

21413677 is a deficient number, since it is larger than the sum of its proper divisors (1).

21413677 is an equidigital number, since it uses as much as digits as its factorization.

21413677 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7056, while the sum is 31.

The square root of 21413677 is about 4627.4914370531. The cubic root of 21413677 is about 277.6922434899.

The spelling of 21413677 in words is "twenty-one million, four hundred thirteen thousand, six hundred seventy-seven".