21677612 has 12 divisors (see below), whose sum is σ = 41384616. Its totient is φ = 9853440.

The previous prime is 21677611. The next prime is 21677629.

21677612 is nontrivially palindromic in base 10.

It is not an unprimeable number, because it can be changed into a prime (21677611) 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 3 ways as a sum of consecutive naturals, for example, 246293 + ... + 246380.

It is an arithmetic number, because the mean of its divisors is an integer number (3448718).

Almost surely, 2^21677612 is an apocalyptic number.

21677612 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21677612 is a deficient number, since it is larger than the sum of its proper divisors (19707004).

21677612 is a wasteful number, since it uses less digits than its factorization.

21677612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 492688 (or 492686 counting only the distinct ones).

The product of its digits is 7056, while the sum is 32.

The square root of 21677612 is about 4655.9222502099. The cubic root of 21677612 is about 278.8284896306.

It can be divided in two parts, 2167 and 7612, that added together give a palindrome (9779).

The spelling of 21677612 in words is "twenty-one million, six hundred seventy-seven thousand, six hundred twelve".