21676630 has 16 divisors (see below), whose sum is σ = 40363920. Its totient is φ = 8371552.

The previous prime is 21676619. The next prime is 21676631. The reversal of 21676630 is 3667612.

It is a super-3 number, since 3×21676630³ (a number of 23 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21676592 and 21676601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21676631) 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 7 ways as a sum of consecutive naturals, for example, 37084 + ... + 37663.

It is an arithmetic number, because the mean of its divisors is an integer number (2522745).

Almost surely, 2^21676630 is an apocalyptic number.

21676630 is a deficient number, since it is larger than the sum of its proper divisors (18687290).

21676630 is a wasteful number, since it uses less digits than its factorization.

21676630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74783.

The product of its (nonzero) digits is 9072, while the sum is 31.

The square root of 21676630 is about 4655.8167919281. The cubic root of 21676630 is about 278.8242792390.

The spelling of 21676630 in words is "twenty-one million, six hundred seventy-six thousand, six hundred thirty".