21113677 has 12 divisors (see below), whose sum is σ = 24210900. Its totient is φ = 18340608.

The previous prime is 21113671. The next prime is 21113689. The reversal of 21113677 is 77631112.

It can be written as a sum of positive squares in 6 ways, for example, as 447561 + 20666116 = 669^2 + 4546^2 .

It is not a de Polignac number, because 21113677 - 2⁷ = 21113549 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21113671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 802 + ... + 6547.

It is an arithmetic number, because the mean of its divisors is an integer number (2017575).

Almost surely, 2^21113677 is an apocalyptic number.

It is an amenable number.

21113677 is a deficient number, since it is larger than the sum of its proper divisors (3097223).

21113677 is a wasteful number, since it uses less digits than its factorization.

21113677 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7392 (or 7379 counting only the distinct ones).

The product of its digits is 1764, while the sum is 28.

The square root of 21113677 is about 4594.9621325970. The cubic root of 21113677 is about 276.3893414686.

Adding to 21113677 its reverse (77631112), we get a palindrome (98744789).

The spelling of 21113677 in words is "twenty-one million, one hundred thirteen thousand, six hundred seventy-seven".