21358797 has 8 divisors (see below), whose sum is σ = 28534944. Its totient is φ = 14210928.

The previous prime is 21358787. The next prime is 21358811. The reversal of 21358797 is 79785312.

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

It is not a de Polignac number, because 21358797 - 2⁴ = 21358781 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21358747) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5238 + ... + 8375.

It is an arithmetic number, because the mean of its divisors is an integer number (3566868).

Almost surely, 2^21358797 is an apocalyptic number.

It is an amenable number.

21358797 is a deficient number, since it is larger than the sum of its proper divisors (7176147).

21358797 is a wasteful number, since it uses less digits than its factorization.

21358797 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14139.

The product of its digits is 105840, while the sum is 42.

The square root of 21358797 is about 4621.5578542305. The cubic root of 21358797 is about 277.4548128679.

It can be divided in two parts, 21358 and 797, that added together give a triangular number (22155 = T₂₁₀).

The spelling of 21358797 in words is "twenty-one million, three hundred fifty-eight thousand, seven hundred ninety-seven".