21021210212201 has 8 divisors (see below), whose sum is σ = 21044061537600. Its totient is φ = 20998363245840.

The previous prime is 21021210212147. The next prime is 21021210212231. The reversal of 21021210212201 is 10221201212012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21021210212201 - 2⁴² = 16623163701097 is a prime.

It is a super-2 number, since 2×21021210212201² (a number of 27 digits) contains 22 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 21021210212201.

It is not an unprimeable number, because it can be changed into a prime (21021210212231) 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 in 7 ways as a sum of consecutive naturals, for example, 8607215 + ... + 10776203.

It is an arithmetic number, because the mean of its divisors is an integer number (2630507692200).

Almost surely, 2^{21021210212201} is an apocalyptic number.

It is an amenable number.

21021210212201 is a deficient number, since it is larger than the sum of its proper divisors (22851325399).

21021210212201 is a wasteful number, since it uses less digits than its factorization.

21021210212201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2179519.

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

Adding to 21021210212201 its reverse (10221201212012), we get a palindrome (31242411424213).

The spelling of 21021210212201 in words is "twenty-one trillion, twenty-one billion, two hundred ten million, two hundred twelve thousand, two hundred one".