21058642 has 8 divisors (see below), whose sum is σ = 34459632. Its totient is φ = 9572100.

The previous prime is 21058633. The next prime is 21058657. The reversal of 21058642 is 24685012.

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

It is a self number, because there is not a number n which added to its sum of digits gives 21058642.

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, 478584 + ... + 478627.

It is an arithmetic number, because the mean of its divisors is an integer number (4307454).

Almost surely, 2^21058642 is an apocalyptic number.

21058642 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21058642 is a deficient number, since it is larger than the sum of its proper divisors (13400990).

21058642 is a wasteful number, since it uses less digits than its factorization.

21058642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 957224.

The product of its (nonzero) digits is 3840, while the sum is 28.

The square root of 21058642 is about 4588.9696011196. The cubic root of 21058642 is about 276.1489866343.

The spelling of 21058642 in words is "twenty-one million, fifty-eight thousand, six hundred forty-two".