21213602033525 has 48 divisors (see below), whose sum is σ = 29365089228288. Its totient is φ = 15068503128000.

The previous prime is 21213602033489. The next prime is 21213602033539. The reversal of 21213602033525 is 52533020631212.

It is not a de Polignac number, because 21213602033525 - 2²⁰ = 21213600984949 is a prime.

It is a super-3 number, since 3×21213602033525³ (a number of 41 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 325474190 + ... + 325539360.

It is an arithmetic number, because the mean of its divisors is an integer number (611772692256).

Almost surely, 2^{21213602033525} is an apocalyptic number.

21213602033525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21213602033525 is a deficient number, since it is larger than the sum of its proper divisors (8151487194763).

21213602033525 is a wasteful number, since it uses less digits than its factorization.

21213602033525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92762 (or 92757 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 35.

Adding to 21213602033525 its reverse (52533020631212), we get a palindrome (73746622664737).

The spelling of 21213602033525 in words is "twenty-one trillion, two hundred thirteen billion, six hundred two million, thirty-three thousand, five hundred twenty-five".