21026672 has 20 divisors (see below), whose sum is σ = 41607456. Its totient is φ = 10289280.

The previous prime is 21026657. The next prime is 21026689. The reversal of 21026672 is 27662012.

It is a congruent number.

It is an unprimeable number.

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, 13229 + ... + 14732.

Almost surely, 2^21026672 is an apocalyptic number.

It is an amenable number.

21026672 is a deficient number, since it is larger than the sum of its proper divisors (20580784).

21026672 is a wasteful number, since it uses less digits than its factorization.

21026672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28016 (or 28010 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 21026672 is about 4585.4849252833. The cubic root of 21026672 is about 276.0091714379.

Adding to 21026672 its reverse (27662012), we get a palindrome (48688684).

The spelling of 21026672 in words is "twenty-one million, twenty-six thousand, six hundred seventy-two".