21458494 has 12 divisors (see below), whose sum is σ = 33636456. Its totient is φ = 10247732.

The previous prime is 21458453. The next prime is 21458527. The reversal of 21458494 is 49485412.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 31077 + ... + 31759.

It is an arithmetic number, because the mean of its divisors is an integer number (2803038).

Almost surely, 2^21458494 is an apocalyptic number.

21458494 is a deficient number, since it is larger than the sum of its proper divisors (12177962).

21458494 is an frugal number, since it uses more digits than its factorization.

21458494 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1391 (or 708 counting only the distinct ones).

The product of its digits is 46080, while the sum is 37.

The square root of 21458494 is about 4632.3313784746. The cubic root of 21458494 is about 277.8858372231.

It can be divided in two parts, 21458 and 494, that added together give a cube (21952 = 28³).

The spelling of 21458494 in words is "twenty-one million, four hundred fifty-eight thousand, four hundred ninety-four".