21144053220 has 48 divisors (see below), whose sum is σ = 59231208960. Its totient is φ = 5635760896.

The previous prime is 21144053219. The next prime is 21144053291. The reversal of 21144053220 is 2235044112.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 47341 + ... + 211019.

It is an arithmetic number, because the mean of its divisors is an integer number (1233983520).

Almost surely, 2^21144053220 is an apocalyptic number.

21144053220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21144053220 is an abundant number, since it is smaller than the sum of its proper divisors (38087155740).

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

21144053220 is a wasteful number, since it uses less digits than its factorization.

21144053220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165844 (or 165842 counting only the distinct ones).

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

Adding to 21144053220 its reverse (2235044112), we get a palindrome (23379097332).

The spelling of 21144053220 in words is "twenty-one billion, one hundred forty-four million, fifty-three thousand, two hundred twenty".