21148581294 has 96 divisors (see below), whose sum is σ = 49514643360. Its totient is φ = 6503328000.

The previous prime is 21148581283. The next prime is 21148581347. The reversal of 21148581294 is 49218584112.

21148581294 is a `hidden beast` number, since 2 + 1 + 1 + 48 + 581 + 29 + 4 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2102044 + ... + 2112080.

It is an arithmetic number, because the mean of its divisors is an integer number (515777535).

Almost surely, 2^21148581294 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21148581294, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24757321680).

21148581294 is an abundant number, since it is smaller than the sum of its proper divisors (28366062066).

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

21148581294 is a wasteful number, since it uses less digits than its factorization.

21148581294 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10226 (or 10223 counting only the distinct ones).

The product of its digits is 184320, while the sum is 45.

The spelling of 21148581294 in words is "twenty-one billion, one hundred forty-eight million, five hundred eighty-one thousand, two hundred ninety-four".