21210112221201 has 12 divisors (see below), whose sum is σ = 30940163703540. Its totient is φ = 14000074072800.

The previous prime is 21210112221191. The next prime is 21210112221209. The reversal of 21210112221201 is 10212221101212.

21210112221201 is a `hidden beast` number, since 21 + 210 + 1 + 12 + 221 + 201 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 16359881220225 + 4850231000976 = 4044735^2 + 2202324^2 .

It is not a de Polignac number, because 21210112221201 - 2²² = 21210108026897 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21210112221209) 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, 11666727486 + ... + 11666729303.

It is an arithmetic number, because the mean of its divisors is an integer number (2578346975295).

Almost surely, 2^{21210112221201} is an apocalyptic number.

It is an amenable number.

21210112221201 is a deficient number, since it is larger than the sum of its proper divisors (9730051482339).

21210112221201 is a wasteful number, since it uses less digits than its factorization.

21210112221201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23333456896 (or 23333456893 counting only the distinct ones).

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

Adding to 21210112221201 its reverse (10212221101212), we get a palindrome (31422333322413).

The spelling of 21210112221201 in words is "twenty-one trillion, two hundred ten billion, one hundred twelve million, two hundred twenty-one thousand, two hundred one".