21242053040 has 80 divisors (see below), whose sum is σ = 53317941600. Its totient is φ = 7823886336.

The previous prime is 21242053039. The next prime is 21242053051. The reversal of 21242053040 is 4035024212.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

It is a junction number, because it is equal to n+sod(n) for n = 21242052997 and 21242053015.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 400391 + ... + 450329.

It is an arithmetic number, because the mean of its divisors is an integer number (666474270).

Almost surely, 2^21242053040 is an apocalyptic number.

21242053040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21242053040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26658970800).

21242053040 is an abundant number, since it is smaller than the sum of its proper divisors (32075888560).

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

21242053040 is a wasteful number, since it uses less digits than its factorization.

21242053040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50374 (or 50368 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 23.

Adding to 21242053040 its reverse (4035024212), we get a palindrome (25277077252).

The spelling of 21242053040 in words is "twenty-one billion, two hundred forty-two million, fifty-three thousand, forty".