21026797 has 8 divisors (see below), whose sum is σ = 22976352. Its totient is φ = 19083600.

The previous prime is 21026779. The next prime is 21026801. The reversal of 21026797 is 79762012.

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

It is a cyclic number.

It is not a de Polignac number, because 21026797 - 2¹⁹ = 20502509 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 (21026717) 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, 7743 + ... + 10099.

It is an arithmetic number, because the mean of its divisors is an integer number (2872044).

Almost surely, 2^21026797 is an apocalyptic number.

It is an amenable number.

21026797 is a deficient number, since it is larger than the sum of its proper divisors (1949555).

21026797 is a wasteful number, since it uses less digits than its factorization.

21026797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3179.

The product of its (nonzero) digits is 10584, while the sum is 34.

The square root of 21026797 is about 4585.4985552282. The cubic root of 21026797 is about 276.0097183794.

The spelling of 21026797 in words is "twenty-one million, twenty-six thousand, seven hundred ninety-seven".