21704700211 has 2 divisors, whose sum is σ = 21704700212. Its totient is φ = 21704700210.

The previous prime is 21704700197. The next prime is 21704700229. The reversal of 21704700211 is 11200740712.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21704700211 - 2¹³ = 21704692019 is a prime.

It is a super-2 number, since 2×21704700211² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21704700271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10852350105 + 10852350106.

It is an arithmetic number, because the mean of its divisors is an integer number (10852350106).

Almost surely, 2^21704700211 is an apocalyptic number.

21704700211 is a deficient number, since it is larger than the sum of its proper divisors (1).

21704700211 is an equidigital number, since it uses as much as digits as its factorization.

21704700211 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 784, while the sum is 25.

The spelling of 21704700211 in words is "twenty-one billion, seven hundred four million, seven hundred thousand, two hundred eleven".