21248897399 has 8 divisors (see below), whose sum is σ = 22368781440. Its totient is φ = 20129165496.

The previous prime is 21248897389. The next prime is 21248897413. The reversal of 21248897399 is 99379884212.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21248897399 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 (21248897359) 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, 350552 + ... + 406674.

It is an arithmetic number, because the mean of its divisors is an integer number (2796097680).

Almost surely, 2^21248897399 is an apocalyptic number.

21248897399 is a deficient number, since it is larger than the sum of its proper divisors (1119884041).

21248897399 is a wasteful number, since it uses less digits than its factorization.

21248897399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76069.

The product of its digits is 15676416, while the sum is 62.

The spelling of 21248897399 in words is "twenty-one billion, two hundred forty-eight million, eight hundred ninety-seven thousand, three hundred ninety-nine".