21044153020 has 36 divisors (see below), whose sum is σ = 48575476152. Its totient is φ = 7652418400.

The previous prime is 21044153003. The next prime is 21044153027. The reversal of 21044153020 is 2035144012.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a junction number, because it is equal to n+sod(n) for n = 21044152982 and 21044153000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21044153027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4345546 + ... + 4350385.

It is an arithmetic number, because the mean of its divisors is an integer number (1349318782).

Almost surely, 2^21044153020 is an apocalyptic number.

21044153020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21044153020 is an abundant number, since it is smaller than the sum of its proper divisors (27531323132).

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

21044153020 is a wasteful number, since it uses less digits than its factorization.

21044153020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8695962 (or 8695949 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 22.

Adding to 21044153020 its reverse (2035144012), we get a palindrome (23079297032).

The spelling of 21044153020 in words is "twenty-one billion, forty-four million, one hundred fifty-three thousand, twenty".