21352525204206 has 72 divisors (see below), whose sum is σ = 50756757578856. Its totient is φ = 5970918720480.

The previous prime is 21352525204201. The next prime is 21352525204207. The reversal of 21352525204206 is 60240252525312.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21352525204201) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 15789585 + ... + 17088476.

It is an arithmetic number, because the mean of its divisors is an integer number (704954966373).

Almost surely, 2^{21352525204206} is an apocalyptic number.

21352525204206 is an abundant number, since it is smaller than the sum of its proper divisors (29404232374650).

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

21352525204206 is a wasteful number, since it uses less digits than its factorization.

21352525204206 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32878174 (or 32878120 counting only the distinct ones).

The product of its (nonzero) digits is 288000, while the sum is 39.

Adding to 21352525204206 its reverse (60240252525312), we get a palindrome (81592777729518).

The spelling of 21352525204206 in words is "twenty-one trillion, three hundred fifty-two billion, five hundred twenty-five million, two hundred four thousand, two hundred six".