21481468 has 6 divisors (see below), whose sum is σ = 37592576. Its totient is φ = 10740732.

The previous prime is 21481459. The next prime is 21481469. The reversal of 21481468 is 86418412.

It is a super-2 number, since 2×21481468² = 922906934870048, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21481469) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2685180 + ... + 2685187.

Almost surely, 2^21481468 is an apocalyptic number.

It is an amenable number.

21481468 is a deficient number, since it is larger than the sum of its proper divisors (16111108).

21481468 is a wasteful number, since it uses less digits than its factorization.

21481468 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5370371 (or 5370369 counting only the distinct ones).

The product of its digits is 12288, while the sum is 34.

The square root of 21481468 is about 4634.8104599865. The cubic root of 21481468 is about 277.9849723602.

The spelling of 21481468 in words is "twenty-one million, four hundred eighty-one thousand, four hundred sixty-eight".