21351676 has 12 divisors (see below), whose sum is σ = 37449720. Its totient is φ = 10651760.

The previous prime is 21351661. The next prime is 21351679. The reversal of 21351676 is 67615312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21351679) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3946 + ... + 7633.

It is an arithmetic number, because the mean of its divisors is an integer number (3120810).

Almost surely, 2^21351676 is an apocalyptic number.

It is an amenable number.

21351676 is a deficient number, since it is larger than the sum of its proper divisors (16098044).

21351676 is a wasteful number, since it uses less digits than its factorization.

21351676 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12044 (or 12042 counting only the distinct ones).

The product of its digits is 7560, while the sum is 31.

The square root of 21351676 is about 4620.7873787916. The cubic root of 21351676 is about 277.4239750616.

Adding to 21351676 its reverse (67615312), we get a palindrome (88966988).

The spelling of 21351676 in words is "twenty-one million, three hundred fifty-one thousand, six hundred seventy-six".