21541458 has 8 divisors (see below), whose sum is σ = 43082928. Its totient is φ = 7180484.

The previous prime is 21541453. The next prime is 21541477. The reversal of 21541458 is 85414512.

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

21541458 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (21541451) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1795116 + ... + 1795127.

It is an arithmetic number, because the mean of its divisors is an integer number (5385366).

Almost surely, 2^21541458 is an apocalyptic number.

21541458 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21541458 is a wasteful number, since it uses less digits than its factorization.

21541458 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3590248.

The product of its digits is 6400, while the sum is 30.

The square root of 21541458 is about 4641.2776258268. The cubic root of 21541458 is about 278.2435024706.

The spelling of 21541458 in words is "twenty-one million, five hundred forty-one thousand, four hundred fifty-eight".