21112021221201 has 6 divisors (see below), whose sum is σ = 30495141763970. Its totient is φ = 14074680814128.

The previous prime is 21112021221163. The next prime is 21112021221211. The reversal of 21112021221201 is 10212212021112.

21112021221201 is a `hidden beast` number, since 211 + 1 + 20 + 212 + 21 + 201 = 666.

It can be written as a sum of positive squares in only one way, i.e., 13844360081601 + 7267661139600 = 3720801^2 + 2695860^2 .

It is not a de Polignac number, because 21112021221201 - 2¹⁹ = 21112020696913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21112021221211) 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 5 ways as a sum of consecutive naturals, for example, 1172890067836 + ... + 1172890067853.

Almost surely, 2^{21112021221201} is an apocalyptic number.

It is an amenable number.

21112021221201 is a deficient number, since it is larger than the sum of its proper divisors (9383120542769).

21112021221201 is a wasteful number, since it uses less digits than its factorization.

21112021221201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2345780135695 (or 2345780135692 counting only the distinct ones).

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

Adding to 21112021221201 its reverse (10212212021112), we get a palindrome (31324233242313).

The spelling of 21112021221201 in words is "twenty-one trillion, one hundred twelve billion, twenty-one million, two hundred twenty-one thousand, two hundred one".