21249441792 has 180 divisors, whose sum is σ = 62566620480. Its totient is φ = 6946947072.

The previous prime is 21249441781. The next prime is 21249441803. The reversal of 21249441792 is 29714494212.

It is an interprime number because it is at equal distance from previous prime (21249441781) and next prime (21249441803).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7813809 + ... + 7816527.

It is an arithmetic number, because the mean of its divisors is an integer number (347592336).

Almost surely, 2^21249441792 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 21249441792, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31283310240).

21249441792 is an abundant number, since it is smaller than the sum of its proper divisors (41317178688).

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

21249441792 is an equidigital number, since it uses as much as digits as its factorization.

21249441792 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2806 (or 2777 counting only the distinct ones).

The product of its digits is 290304, while the sum is 45.

The spelling of 21249441792 in words is "twenty-one billion, two hundred forty-nine million, four hundred forty-one thousand, seven hundred ninety-two".