21213600656041 has 16 divisors (see below), whose sum is σ = 21752957395728. Its totient is φ = 20680437657600.

The previous prime is 21213600655979. The next prime is 21213600656081. The reversal of 21213600656041 is 14065600631212.

It can be written as a sum of positive squares in 8 ways, for example, as 5278965760000 + 15934634896041 = 2297600^2 + 3991821^2 .

It is a cyclic number.

It is not a de Polignac number, because 21213600656041 - 2¹⁵ = 21213600623273 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21213600656081) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 378239121 + ... + 378295201.

It is an arithmetic number, because the mean of its divisors is an integer number (1359559837233).

Almost surely, 2^{21213600656041} is an apocalyptic number.

It is an amenable number.

21213600656041 is a deficient number, since it is larger than the sum of its proper divisors (539356739687).

21213600656041 is a wasteful number, since it uses less digits than its factorization.

21213600656041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111132.

The product of its (nonzero) digits is 51840, while the sum is 37.

The spelling of 21213600656041 in words is "twenty-one trillion, two hundred thirteen billion, six hundred million, six hundred fifty-six thousand, forty-one".