21304453253000 has 32 divisors (see below), whose sum is σ = 49852420614360. Its totient is φ = 8521781300800.

The previous prime is 21304453252997. The next prime is 21304453253029. The reversal of 21304453253000 is 35235440312.

It can be written as a sum of positive squares in 4 ways, for example, as 9501202089604 + 11803251163396 = 3082402^2 + 3435586^2 .

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, 10652225627 + ... + 10652227626.

Almost surely, 2^{21304453253000} is an apocalyptic number.

21304453253000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21304453253000 is an abundant number, since it is smaller than the sum of its proper divisors (28547967361360).

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

21304453253000 is a wasteful number, since it uses less digits than its factorization.

21304453253000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21304453274 (or 21304453260 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 32.

Adding to 21304453253000 its reverse (35235440312), we get a palindrome (21339688693312).

The spelling of 21304453253000 in words is "twenty-one trillion, three hundred four billion, four hundred fifty-three million, two hundred fifty-three thousand".