21704700212 has 48 divisors (see below), whose sum is σ = 42335085072. Its totient is φ = 9672376320.

The previous prime is 21704700211. The next prime is 21704700229. The reversal of 21704700212 is 21200740712.

It can be written as a sum of positive squares in 8 ways, for example, as 8061525796 + 13643174416 = 89786^2 + 116804^2 .

It is a super-2 number, since 2×21704700212² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21704700211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 154328 + ... + 259280.

It is an arithmetic number, because the mean of its divisors is an integer number (881980939).

Almost surely, 2^21704700212 is an apocalyptic number.

It is an amenable number.

21704700212 is a deficient number, since it is larger than the sum of its proper divisors (20630384860).

21704700212 is a wasteful number, since it uses less digits than its factorization.

21704700212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105108 (or 105106 counting only the distinct ones).

The product of its (nonzero) digits is 1568, while the sum is 26.

The spelling of 21704700212 in words is "twenty-one billion, seven hundred four million, seven hundred thousand, two hundred twelve".