21321052044 has 48 divisors (see below), whose sum is σ = 52880633568. Its totient is φ = 6662914048.

The previous prime is 21321052043. The next prime is 21321052091. The reversal of 21321052044 is 44025012312.

It is not an unprimeable number, because it can be changed into a prime (21321052043) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 150909 + ... + 255764.

It is an arithmetic number, because the mean of its divisors is an integer number (1101679866).

Almost surely, 2^21321052044 is an apocalyptic number.

It is an amenable number.

21321052044 is an abundant number, since it is smaller than the sum of its proper divisors (31559581524).

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

21321052044 is a wasteful number, since it uses less digits than its factorization.

21321052044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 406954 (or 406952 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 24.

Adding to 21321052044 its reverse (44025012312), we get a palindrome (65346064356).

The spelling of 21321052044 in words is "twenty-one billion, three hundred twenty-one million, fifty-two thousand, forty-four".