21337216606751 has 2 divisors, whose sum is σ = 21337216606752. Its totient is φ = 21337216606750.

The previous prime is 21337216606729. The next prime is 21337216606837. The reversal of 21337216606751 is 15760661273312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21337216606751 - 2²² = 21337212412447 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21337216606751.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21337216606451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10668608303375 + 10668608303376.

It is an arithmetic number, because the mean of its divisors is an integer number (10668608303376).

Almost surely, 2^{21337216606751} is an apocalyptic number.

21337216606751 is a deficient number, since it is larger than the sum of its proper divisors (1).

21337216606751 is an equidigital number, since it uses as much as digits as its factorization.

21337216606751 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1905120, while the sum is 50.

The spelling of 21337216606751 in words is "twenty-one trillion, three hundred thirty-seven billion, two hundred sixteen million, six hundred six thousand, seven hundred fifty-one".