21221044040240 has 80 divisors (see below), whose sum is σ = 53824983480576. Its totient is φ = 7716643065600.

The previous prime is 21221044040227. The next prime is 21221044040263. The reversal of 21221044040240 is 4204044012212.

It is a happy number.

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

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, 119946245 + ... + 120123035.

Almost surely, 2^{21221044040240} is an apocalyptic number.

21221044040240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21221044040240 is an abundant number, since it is smaller than the sum of its proper divisors (32603939440336).

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

21221044040240 is a wasteful number, since it uses less digits than its factorization.

21221044040240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 313218 (or 313212 counting only the distinct ones).

The product of its (nonzero) digits is 4096, while the sum is 26.

Adding to 21221044040240 its reverse (4204044012212), we get a palindrome (25425088052452).

The spelling of 21221044040240 in words is "twenty-one trillion, two hundred twenty-one billion, forty-four million, forty thousand, two hundred forty".