21797739901 has 8 divisors (see below), whose sum is σ = 24961233024. Its totient is φ = 18646629360.

The previous prime is 21797739877. The next prime is 21797739919. The reversal of 21797739901 is 10993779712.

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 21797739901 - 2⁹ = 21797739389 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21797739991) 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, 3091870 + ... + 3098911.

It is an arithmetic number, because the mean of its divisors is an integer number (3120154128).

Almost surely, 2^21797739901 is an apocalyptic number.

It is an amenable number.

21797739901 is a deficient number, since it is larger than the sum of its proper divisors (3163493123).

21797739901 is an equidigital number, since it uses as much as digits as its factorization.

21797739901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6191291.

The product of its (nonzero) digits is 1500282, while the sum is 55.

The spelling of 21797739901 in words is "twenty-one billion, seven hundred ninety-seven million, seven hundred thirty-nine thousand, nine hundred one".