21204034000 has 80 divisors (see below), whose sum is σ = 52657250256. Its totient is φ = 8252352000.

The previous prime is 21204033971. The next prime is 21204034003. The reversal of 21204034000 is 43040212.

It can be written as a sum of positive squares in 8 ways, for example, as 1417673104 + 19786360896 = 37652^2 + 140664^2 .

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×21204034000² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21204034003) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 69271 + ... + 217270.

Almost surely, 2^21204034000 is an apocalyptic number.

21204034000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21204034000 is an abundant number, since it is smaller than the sum of its proper divisors (31453216256).

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

21204034000 is a wasteful number, since it uses less digits than its factorization.

21204034000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 286601 (or 286585 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 16.

Adding to 21204034000 its reverse (43040212), we get a palindrome (21247074212).

The spelling of 21204034000 in words is "twenty-one billion, two hundred four million, thirty-four thousand".