21000343224 has 32 divisors (see below), whose sum is σ = 60000981120. Its totient is φ = 6000098016.

The previous prime is 21000343207. The next prime is 21000343267. The reversal of 21000343224 is 42234300012.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a self number, because there is not a number n which added to its sum of digits gives 21000343224.

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, 62500854 + ... + 62501189.

It is an arithmetic number, because the mean of its divisors is an integer number (1875030660).

Almost surely, 2^21000343224 is an apocalyptic number.

21000343224 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21000343224 is an abundant number, since it is smaller than the sum of its proper divisors (39000637896).

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

21000343224 is a wasteful number, since it uses less digits than its factorization.

21000343224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125002059 (or 125002055 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 21.

Adding to 21000343224 its reverse (42234300012), we get a palindrome (63234643236).

The spelling of 21000343224 in words is "twenty-one billion, three hundred forty-three thousand, two hundred twenty-four".