21943406491248 has 160 divisors (see below), whose sum is σ = 63543950426880. Its totient is φ = 6466532935680.

The previous prime is 21943406491243. The next prime is 21943406491249. The reversal of 21943406491248 is 84219460434912.

It is a super-4 number, since 4×21943406491248⁴ (a number of 54 digits) contains 4444 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21943406491243) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 38535388 + ... + 39100676.

It is an arithmetic number, because the mean of its divisors is an integer number (397149690168).

Almost surely, 2^{21943406491248} 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 21943406491248, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31771975213440).

21943406491248 is an abundant number, since it is smaller than the sum of its proper divisors (41600543935632).

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

21943406491248 is a wasteful number, since it uses less digits than its factorization.

21943406491248 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 567335 (or 567329 counting only the distinct ones).

The product of its (nonzero) digits is 11943936, while the sum is 57.

The spelling of 21943406491248 in words is "twenty-one trillion, nine hundred forty-three billion, four hundred six million, four hundred ninety-one thousand, two hundred forty-eight".