21004203352 has 32 divisors (see below), whose sum is σ = 43034976000. Its totient is φ = 9531402400.

The previous prime is 21004203331. The next prime is 21004203371. The reversal of 21004203352 is 25330240012.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 146524 + ... + 251947.

It is an arithmetic number, because the mean of its divisors is an integer number (1344843000).

Almost surely, 2^21004203352 is an apocalyptic number.

21004203352 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21004203352 is an abundant number, since it is smaller than the sum of its proper divisors (22030772648).

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

21004203352 is a wasteful number, since it uses less digits than its factorization.

21004203352 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 399087 (or 399083 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 22.

Adding to 21004203352 its reverse (25330240012), we get a palindrome (46334443364).

The spelling of 21004203352 in words is "twenty-one billion, four million, two hundred three thousand, three hundred fifty-two".