21828268254 has 64 divisors (see below), whose sum is σ = 48016862208. Its totient is φ = 6573840000.

The previous prime is 21828268223. The next prime is 21828268271. The reversal of 21828268254 is 45286282812.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1775629 + ... + 1787879.

It is an arithmetic number, because the mean of its divisors is an integer number (750263472).

Almost surely, 2^21828268254 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21828268254, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24008431104).

21828268254 is an abundant number, since it is smaller than the sum of its proper divisors (26188593954).

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

21828268254 is a wasteful number, since it uses less digits than its factorization.

21828268254 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12753.

The product of its digits is 983040, while the sum is 48.

The spelling of 21828268254 in words is "twenty-one billion, eight hundred twenty-eight million, two hundred sixty-eight thousand, two hundred fifty-four".