21881548122 has 16 divisors (see below), whose sum is σ = 50014967232. Its totient is φ = 6251870880.

The previous prime is 21881548103. The next prime is 21881548207. The reversal of 21881548122 is 22184518812.

It is a Harshad number since it is a multiple of its sum of digits (42), and also a Moran number because the ratio is a prime number: 520989241 = 21881548122 / (2 + 1 + 8 + 8 + 1 + 5 + 4 + 8 + 1 + 2 + 2).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 260494579 + ... + 260494662.

It is an arithmetic number, because the mean of its divisors is an integer number (3125935452).

Almost surely, 2^21881548122 is an apocalyptic number.

21881548122 is an abundant number, since it is smaller than the sum of its proper divisors (28133419110).

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

21881548122 is a wasteful number, since it uses less digits than its factorization.

21881548122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 520989253.

The product of its digits is 81920, while the sum is 42.

The spelling of 21881548122 in words is "twenty-one billion, eight hundred eighty-one million, five hundred forty-eight thousand, one hundred twenty-two".