21281376248 has 64 divisors (see below), whose sum is σ = 44993387520. Its totient is φ = 9348998400.

The previous prime is 21281376199. The next prime is 21281376283. The reversal of 21281376248 is 84267318212.

It is a hoax number, since the sum of its digits (44) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a junction number, because it is equal to n+sod(n) for n = 21281376199 and 21281376208.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2251340 + ... + 2260772.

It is an arithmetic number, because the mean of its divisors is an integer number (703021680).

Almost surely, 2^21281376248 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21281376248, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22496693760).

21281376248 is an abundant number, since it is smaller than the sum of its proper divisors (23712011272).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21281376248 is a wasteful number, since it uses less digits than its factorization.

21281376248 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10308 (or 10304 counting only the distinct ones).

The product of its digits is 258048, while the sum is 44.

The spelling of 21281376248 in words is "twenty-one billion, two hundred eighty-one million, three hundred seventy-six thousand, two hundred forty-eight".