21201211102212 has 36 divisors (see below), whose sum is σ = 56744417951676. Its totient is φ = 6651360345600.

The previous prime is 21201211102103. The next prime is 21201211102213. The reversal of 21201211102212 is 21220111210212.

21201211102212 is a `hidden beast` number, since 21 + 201 + 211 + 10 + 221 + 2 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 19120277910276 + 2080933191936 = 4372674^2 + 1442544^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×21201211102212² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (21201211102213) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17321250289 + ... + 17321251512.

It is an arithmetic number, because the mean of its divisors is an integer number (1576233831991).

Almost surely, 2^{21201211102212} is an apocalyptic number.

It is an amenable number.

21201211102212 is an abundant number, since it is smaller than the sum of its proper divisors (35543206849464).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21201211102212 is a wasteful number, since it uses less digits than its factorization.

21201211102212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34642501828 (or 34642501823 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 21201211102212 its reverse (21220111210212), we get a palindrome (42421322312424).

The spelling of 21201211102212 in words is "twenty-one trillion, two hundred one billion, two hundred eleven million, one hundred two thousand, two hundred twelve".