21012112221201 has 16 divisors (see below), whose sum is σ = 31129155259200. Its totient is φ = 14008029761664.

The previous prime is 21012112221193. The next prime is 21012112221223. The reversal of 21012112221201 is 10212221121012.

21012112221201 is a `hidden beast` number, since 210 + 1 + 21 + 12 + 221 + 201 = 666.

It is not a de Polignac number, because 21012112221201 - 2³ = 21012112221193 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21012112221101) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8753290 + ... + 10892396.

It is an arithmetic number, because the mean of its divisors is an integer number (1945572203700).

Almost surely, 2^{21012112221201} is an apocalyptic number.

It is an amenable number.

21012112221201 is a deficient number, since it is larger than the sum of its proper divisors (10117043037999).

21012112221201 is a wasteful number, since it uses less digits than its factorization.

21012112221201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2502925 (or 2502919 counting only the distinct ones).

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

Adding to 21012112221201 its reverse (10212221121012), we get a palindrome (31224333342213).

The spelling of 21012112221201 in words is "twenty-one trillion, twelve billion, one hundred twelve million, two hundred twenty-one thousand, two hundred one".