21910038048 has 144 divisors (see below), whose sum is σ = 63062266176. Its totient is φ = 7215137280.

The previous prime is 21910038041. The next prime is 21910038049. The reversal of 21910038048 is 84083001912.

It is a tau number, because it is divible by the number of its divisors (144).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (21910038041) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 20081983 + ... + 20083073.

It is an arithmetic number, because the mean of its divisors is an integer number (437932404).

Almost surely, 2^21910038048 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 21910038048, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31531133088).

21910038048 is an abundant number, since it is smaller than the sum of its proper divisors (41152228128).

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

21910038048 is a wasteful number, since it uses less digits than its factorization.

21910038048 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1887 (or 1876 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

The spelling of 21910038048 in words is "twenty-one billion, nine hundred ten million, thirty-eight thousand, forty-eight".