21021110221201 has 8 divisors (see below), whose sum is σ = 21142840081320. Its totient is φ = 20899382896512.

The previous prime is 21021110221193. The next prime is 21021110221247. The reversal of 21021110221201 is 10212201112012.

It can be written as a sum of positive squares in 4 ways, for example, as 15464831526225 + 5556278694976 = 3932535^2 + 2357176^2 .

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 21021110221201 - 2³ = 21021110221193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21021110222201) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17492295 + ... + 18655363.

It is an arithmetic number, because the mean of its divisors is an integer number (2642855010165).

Almost surely, 2^{21021110221201} is an apocalyptic number.

It is an amenable number.

21021110221201 is a deficient number, since it is larger than the sum of its proper divisors (121729860119).

21021110221201 is a wasteful number, since it uses less digits than its factorization.

21021110221201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1267715.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21021110221201 its reverse (10212201112012), we get a palindrome (31233311333213).

The spelling of 21021110221201 in words is "twenty-one trillion, twenty-one billion, one hundred ten million, two hundred twenty-one thousand, two hundred one".