21421468 has 6 divisors (see below), whose sum is σ = 37487576. Its totient is φ = 10710732.

The previous prime is 21421453. The next prime is 21421489. The reversal of 21421468 is 86412412.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2677680 + ... + 2677687.

Almost surely, 2^21421468 is an apocalyptic number.

It is an amenable number.

21421468 is a deficient number, since it is larger than the sum of its proper divisors (16066108).

21421468 is a wasteful number, since it uses less digits than its factorization.

21421468 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5355371 (or 5355369 counting only the distinct ones).

The product of its digits is 3072, while the sum is 28.

The square root of 21421468 is about 4628.3331772896. Note that the first 3 decimals coincide. The cubic root of 21421468 is about 277.7259172635.

The spelling of 21421468 in words is "twenty-one million, four hundred twenty-one thousand, four hundred sixty-eight".