21224355464424 has 64 divisors (see below), whose sum is σ = 60643265558400. Its totient is φ = 6063876566784.

The previous prime is 21224355464401. The next prime is 21224355464437. The reversal of 21224355464424 is 42446455342212.

It is a happy number.

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, 2224174 + ... + 6884450.

It is an arithmetic number, because the mean of its divisors is an integer number (947551024350).

Almost surely, 2^{21224355464424} is an apocalyptic number.

21224355464424 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21224355464424 is an abundant number, since it is smaller than the sum of its proper divisors (39418910093976).

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

21224355464424 is a wasteful number, since it uses less digits than its factorization.

21224355464424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4687402 (or 4687398 counting only the distinct ones).

The product of its digits is 7372800, while the sum is 48.

The spelling of 21224355464424 in words is "twenty-one trillion, two hundred twenty-four billion, three hundred fifty-five million, four hundred sixty-four thousand, four hundred twenty-four".