21734882197 has 4 divisors (see below), whose sum is σ = 24839865376. Its totient is φ = 18629899020.

The previous prime is 21734882179. The next prime is 21734882207. The reversal of 21734882197 is 79128843712.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21734882197 - 2³¹ = 19587398549 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 (21734882497) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1552491579 + ... + 1552491592.

It is an arithmetic number, because the mean of its divisors is an integer number (6209966344).

Almost surely, 2^21734882197 is an apocalyptic number.

It is an amenable number.

21734882197 is a deficient number, since it is larger than the sum of its proper divisors (3104983179).

21734882197 is an equidigital number, since it uses as much as digits as its factorization.

21734882197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3104983178.

The product of its digits is 1354752, while the sum is 52.

The spelling of 21734882197 in words is "twenty-one billion, seven hundred thirty-four million, eight hundred eighty-two thousand, one hundred ninety-seven".