21421571224000 has 56 divisors (see below), whose sum is σ = 53050521156048. Its totient is φ = 8568628486400.

The previous prime is 21421571223971. The next prime is 21421571224037. The reversal of 21421571224000 is 42217512412.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1338840202 + ... + 1338856201.

Almost surely, 2^{21421571224000} is an apocalyptic number.

21421571224000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21421571224000 is an abundant number, since it is smaller than the sum of its proper divisors (31628949932048).

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

21421571224000 is an equidigital number, since it uses as much as digits as its factorization.

21421571224000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2677696430 (or 2677696410 counting only the distinct ones).

The product of its (nonzero) digits is 8960, while the sum is 31.

Adding to 21421571224000 its reverse (42217512412), we get a palindrome (21463788736412).

The spelling of 21421571224000 in words is "twenty-one trillion, four hundred twenty-one billion, five hundred seventy-one million, two hundred twenty-four thousand".