21221324012040 has 64 divisors (see below), whose sum is σ = 63997291330560. Its totient is φ = 5629391354880.

The previous prime is 21221324011999. The next prime is 21221324012059. The reversal of 21221324012040 is 4021042312212.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 21221324012040.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 462920449 + ... + 462966288.

It is an arithmetic number, because the mean of its divisors is an integer number (999957677040).

Almost surely, 2^{21221324012040} is an apocalyptic number.

21221324012040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21221324012040 is an abundant number, since it is smaller than the sum of its proper divisors (42775967318520).

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

21221324012040 is a wasteful number, since it uses less digits than its factorization.

21221324012040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 925886942 (or 925886938 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 24.

Adding to 21221324012040 its reverse (4021042312212), we get a palindrome (25242366324252).

The spelling of 21221324012040 in words is "twenty-one trillion, two hundred twenty-one billion, three hundred twenty-four million, twelve thousand, forty".