21044032140 has 24 divisors (see below), whose sum is σ = 58923290160. Its totient is φ = 5611741888.

The previous prime is 21044032133. The next prime is 21044032153. The reversal of 21044032140 is 4123044012.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 175366875 + ... + 175366994.

It is an arithmetic number, because the mean of its divisors is an integer number (2455137090).

Almost surely, 2^21044032140 is an apocalyptic number.

21044032140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21044032140 is an abundant number, since it is smaller than the sum of its proper divisors (37879258020).

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

21044032140 is a wasteful number, since it uses less digits than its factorization.

21044032140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 350733881 (or 350733879 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 21.

Adding to 21044032140 its reverse (4123044012), we get a palindrome (25167076152).

The spelling of 21044032140 in words is "twenty-one billion, forty-four million, thirty-two thousand, one hundred forty".