21849399792 has 180 divisors, whose sum is σ = 70135792272. Its totient is φ = 6333043200.

The previous prime is 21849399779. The next prime is 21849399797. The reversal of 21849399792 is 29799394812.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21849399797) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 373492 + ... + 428012.

Almost surely, 2^21849399792 is an apocalyptic number.

21849399792 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21849399792, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35067896136).

21849399792 is an abundant number, since it is smaller than the sum of its proper divisors (48286392480).

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

21849399792 is a wasteful number, since it uses less digits than its factorization.

21849399792 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54580 (or 54560 counting only the distinct ones).

The product of its digits is 17635968, while the sum is 63.

The spelling of 21849399792 in words is "twenty-one billion, eight hundred forty-nine million, three hundred ninety-nine thousand, seven hundred ninety-two".