21612640541210 has 16 divisors (see below), whose sum is σ = 39807468160416. Its totient is φ = 8444008397328.

The previous prime is 21612640541209. The next prime is 21612640541269. The reversal of 21612640541210 is 1214504621612.

It is a Curzon number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 25130976944 + ... + 25130977803.

It is an arithmetic number, because the mean of its divisors is an integer number (2487966760026).

Almost surely, 2^{21612640541210} is an apocalyptic number.

21612640541210 is a deficient number, since it is larger than the sum of its proper divisors (18194827619206).

21612640541210 is a wasteful number, since it uses less digits than its factorization.

21612640541210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50261954797.

The product of its (nonzero) digits is 23040, while the sum is 35.

The spelling of 21612640541210 in words is "twenty-one trillion, six hundred twelve billion, six hundred forty million, five hundred forty-one thousand, two hundred ten".