21491548 has 12 divisors (see below), whose sum is σ = 40503400. Its totient is φ = 9919152.

The previous prime is 21491539. The next prime is 21491563. The reversal of 21491548 is 84519412.

It is a happy number.

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 206598 + ... + 206701.

Almost surely, 2^21491548 is an apocalyptic number.

It is an amenable number.

21491548 is a deficient number, since it is larger than the sum of its proper divisors (19011852).

21491548 is a wasteful number, since it uses less digits than its factorization.

21491548 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 413316 (or 413314 counting only the distinct ones).

The product of its digits is 11520, while the sum is 34.

The square root of 21491548 is about 4635.8977555593. The cubic root of 21491548 is about 278.0284462722.

The spelling of 21491548 in words is "twenty-one million, four hundred ninety-one thousand, five hundred forty-eight".