21056315053211 has 2 divisors, whose sum is σ = 21056315053212. Its totient is φ = 21056315053210.

The previous prime is 21056315053199. The next prime is 21056315053223. The reversal of 21056315053211 is 11235051365012.

It is a balanced prime because it is at equal distance from previous prime (21056315053199) and next prime (21056315053223).

It is a cyclic number.

It is not a de Polignac number, because 21056315053211 - 2¹⁸ = 21056314791067 is a prime.

It is a super-2 number, since 2×21056315053211² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21056315053261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10528157526605 + 10528157526606.

It is an arithmetic number, because the mean of its divisors is an integer number (10528157526606).

Almost surely, 2^{21056315053211} is an apocalyptic number.

21056315053211 is a deficient number, since it is larger than the sum of its proper divisors (1).

21056315053211 is an equidigital number, since it uses as much as digits as its factorization.

21056315053211 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27000, while the sum is 35.

The spelling of 21056315053211 in words is "twenty-one trillion, fifty-six billion, three hundred fifteen million, fifty-three thousand, two hundred eleven".