21216021035325 has 24 divisors (see below), whose sum is σ = 35077968408000. Its totient is φ = 11314948757760.

The previous prime is 21216021035317. The next prime is 21216021035369. The reversal of 21216021035325 is 52353012061212.

It is not a de Polignac number, because 21216021035325 - 2³ = 21216021035317 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4140 + ... + 6513989.

It is an arithmetic number, because the mean of its divisors is an integer number (1461582017000).

Almost surely, 2^{21216021035325} is an apocalyptic number.

21216021035325 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21216021035325 is a deficient number, since it is larger than the sum of its proper divisors (13861947372675).

21216021035325 is a wasteful number, since it uses less digits than its factorization.

21216021035325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6561541 (or 6561536 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 33.

Adding to 21216021035325 its reverse (52353012061212), we get a palindrome (73569033096537).

The spelling of 21216021035325 in words is "twenty-one trillion, two hundred sixteen billion, twenty-one million, thirty-five thousand, three hundred twenty-five".