21010212212201 has 32 divisors (see below), whose sum is σ = 22382770176000. Its totient is φ = 19680642641088.

The previous prime is 21010212212189. The next prime is 21010212212219. The reversal of 21010212212201 is 10221221201012.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21010212212201 is a prime.

It is a super-3 number, since 3×21010212212201³ (a number of 41 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21010212212201.

It is not an unprimeable number, because it can be changed into a prime (21010212212281) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 126436496 + ... + 126602558.

It is an arithmetic number, because the mean of its divisors is an integer number (699461568000).

Almost surely, 2^{21010212212201} is an apocalyptic number.

It is an amenable number.

21010212212201 is a deficient number, since it is larger than the sum of its proper divisors (1372557963799).

21010212212201 is a wasteful number, since it uses less digits than its factorization.

21010212212201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166733.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21010212212201 its reverse (10221221201012), we get a palindrome (31231433413213).

The spelling of 21010212212201 in words is "twenty-one trillion, ten billion, two hundred twelve million, two hundred twelve thousand, two hundred one".