21104031701660 has 48 divisors (see below), whose sum is σ = 45933843537120. Its totient is φ = 8138108102400.

The previous prime is 21104031701569. The next prime is 21104031701663. The reversal of 21104031701660 is 6610713040112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21104031701663) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 130740266 + ... + 130901585.

It is an arithmetic number, because the mean of its divisors is an integer number (956955073690).

Almost surely, 2^{21104031701660} is an apocalyptic number.

21104031701660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21104031701660 is an abundant number, since it is smaller than the sum of its proper divisors (24829811835460).

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

21104031701660 is a wasteful number, since it uses less digits than its factorization.

21104031701660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 261642006 (or 261642004 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 32.

Adding to 21104031701660 its reverse (6610713040112), we get a palindrome (27714744741772).

The spelling of 21104031701660 in words is "twenty-one trillion, one hundred four billion, thirty-one million, seven hundred one thousand, six hundred sixty".