21033142224 has 40 divisors (see below), whose sum is σ = 55256567520. Its totient is φ = 6892215168.

The previous prime is 21033142219. The next prime is 21033142259. The reversal of 21033142224 is 42224133012.

It is a happy number.

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

It is a junction number, because it is equal to n+sod(n) for n = 21033142194 and 21033142203.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3710647 + ... + 3716310.

It is an arithmetic number, because the mean of its divisors is an integer number (1381414188).

Almost surely, 2^21033142224 is an apocalyptic number.

21033142224 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21033142224 is an abundant number, since it is smaller than the sum of its proper divisors (34223425296).

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

21033142224 is a wasteful number, since it uses less digits than its factorization.

21033142224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7427027 (or 7427021 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 24.

Adding to 21033142224 its reverse (42224133012), we get a palindrome (63257275236).

The spelling of 21033142224 in words is "twenty-one billion, thirty-three million, one hundred forty-two thousand, two hundred twenty-four".