21004334343225 has 36 divisors (see below), whose sum is σ = 38150971252992. Its totient is φ = 11044532604000.

The previous prime is 21004334343203. The next prime is 21004334343247. The reversal of 21004334343225 is 52234343340012.

21004334343225 is a `hidden beast` number, since 2 + 10 + 0 + 43 + 343 + 43 + 225 = 666.

It is an interprime number because it is at equal distance from previous prime (21004334343203) and next prime (21004334343247).

It is not a de Polignac number, because 21004334343225 - 2¹² = 21004334339129 is a prime.

It is a super-2 number, since 2×21004334343225² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21004334343225.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 657396681 + ... + 657428630.

It is an arithmetic number, because the mean of its divisors is an integer number (1059749201472).

Almost surely, 2^{21004334343225} is an apocalyptic number.

21004334343225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21004334343225 is a deficient number, since it is larger than the sum of its proper divisors (17146636909767).

21004334343225 is a wasteful number, since it uses less digits than its factorization.

21004334343225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1314825398 (or 1314825390 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 36.

Adding to 21004334343225 its reverse (52234343340012), we get a palindrome (73238677683237).

The spelling of 21004334343225 in words is "twenty-one trillion, four billion, three hundred thirty-four million, three hundred forty-three thousand, two hundred twenty-five".