21044925040 has 40 divisors (see below), whose sum is σ = 49062841920. Its totient is φ = 8395021056.

The previous prime is 21044925029. The next prime is 21044925047. The reversal of 21044925040 is 4052944012.

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 21044924993 and 21044925011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21044925047) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 329035 + ... + 387754.

It is an arithmetic number, because the mean of its divisors is an integer number (1226571048).

Almost surely, 2^21044925040 is an apocalyptic number.

21044925040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21044925040 is an abundant number, since it is smaller than the sum of its proper divisors (28017916880).

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

21044925040 is a wasteful number, since it uses less digits than its factorization.

21044925040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 717169 (or 717163 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 31.

The spelling of 21044925040 in words is "twenty-one billion, forty-four million, nine hundred twenty-five thousand, forty".