21058797 has 8 divisors (see below), whose sum is σ = 28368256. Its totient is φ = 13894272.

The previous prime is 21058787. The next prime is 21058819. The reversal of 21058797 is 79785012.

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

It is not a de Polignac number, because 21058797 - 2⁴ = 21058781 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21058747) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35893 + ... + 36474.

It is an arithmetic number, because the mean of its divisors is an integer number (3546032).

Almost surely, 2^21058797 is an apocalyptic number.

It is an amenable number.

21058797 is a deficient number, since it is larger than the sum of its proper divisors (7309459).

21058797 is an equidigital number, since it uses as much as digits as its factorization.

21058797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72467.

The product of its (nonzero) digits is 35280, while the sum is 39.

The square root of 21058797 is about 4588.9864894114. The cubic root of 21058797 is about 276.1496641548.

The spelling of 21058797 in words is "twenty-one million, fifty-eight thousand, seven hundred ninety-seven".