21044023340 has 12 divisors (see below), whose sum is σ = 44192449056. Its totient is φ = 8417609328.

The previous prime is 21044023331. The next prime is 21044023369. The reversal of 21044023340 is 4332044012.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 526100564 + ... + 526100603.

It is an arithmetic number, because the mean of its divisors is an integer number (3682704088).

Almost surely, 2^21044023340 is an apocalyptic number.

21044023340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21044023340 is an abundant number, since it is smaller than the sum of its proper divisors (23148425716).

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

21044023340 is a wasteful number, since it uses less digits than its factorization.

21044023340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1052201176 (or 1052201174 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 23.

Adding to 21044023340 its reverse (4332044012), we get a palindrome (25376067352).

The spelling of 21044023340 in words is "twenty-one billion, forty-four million, twenty-three thousand, three hundred forty".