21541486 has 8 divisors (see below), whose sum is σ = 32567040. Its totient is φ = 10685808.

The previous prime is 21541477. The next prime is 21541493. The reversal of 21541486 is 68414512.

It is a sphenic number, since it is the product of 3 distinct primes.

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, 42151 + ... + 42658.

It is an arithmetic number, because the mean of its divisors is an integer number (4070880).

Almost surely, 2^21541486 is an apocalyptic number.

21541486 is a deficient number, since it is larger than the sum of its proper divisors (11025554).

21541486 is a wasteful number, since it uses less digits than its factorization.

21541486 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84938.

The product of its digits is 7680, while the sum is 31.

The square root of 21541486 is about 4641.2806422366. The cubic root of 21541486 is about 278.2436230260.

Adding to 21541486 its reverse (68414512), we get a palindrome (89955998).

The spelling of 21541486 in words is "twenty-one million, five hundred forty-one thousand, four hundred eighty-six".