21223543400040 has 64 divisors (see below), whose sum is σ = 63671745168000. Its totient is φ = 5659512465152.

The previous prime is 21223543399931. The next prime is 21223543400099. The reversal of 21223543400040 is 4000434532212.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 21223543399980 and 21223543400007.

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, 5464414 + ... + 8503346.

It is an arithmetic number, because the mean of its divisors is an integer number (994871018250).

Almost surely, 2^{21223543400040} is an apocalyptic number.

21223543400040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21223543400040 is an abundant number, since it is smaller than the sum of its proper divisors (42448201767960).

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

21223543400040 is a wasteful number, since it uses less digits than its factorization.

21223543400040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3097146 (or 3097142 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 30.

Adding to 21223543400040 its reverse (4000434532212), we get a palindrome (25223977932252).

The spelling of 21223543400040 in words is "twenty-one trillion, two hundred twenty-three billion, five hundred forty-three million, four hundred thousand, forty".