21448215197 has 8 divisors (see below), whose sum is σ = 21801811200. Its totient is φ = 21097414800.

The previous prime is 21448215193. The next prime is 21448215203. The reversal of 21448215197 is 79151284412.

It is a happy number.

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 21448215197 - 2² = 21448215193 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 (21448215193) 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, 683429 + ... + 714122.

It is an arithmetic number, because the mean of its divisors is an integer number (2725226400).

Almost surely, 2^21448215197 is an apocalyptic number.

It is an amenable number.

21448215197 is a deficient number, since it is larger than the sum of its proper divisors (353596003).

21448215197 is a wasteful number, since it uses less digits than its factorization.

21448215197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1397803.

The product of its digits is 161280, while the sum is 44.

The spelling of 21448215197 in words is "twenty-one billion, four hundred forty-eight million, two hundred fifteen thousand, one hundred ninety-seven".