21211111012201 has 16 divisors (see below), whose sum is σ = 23580713779200. Its totient is φ = 18916426205200.

The previous prime is 21211111012153. The next prime is 21211111012339. The reversal of 21211111012201 is 10221011111212.

It is a cyclic number.

It is not a de Polignac number, because 21211111012201 - 2⁹ = 21211111011689 is a prime.

It is a super-2 number, since 2×21211111012201² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21211111012001) 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, 33804745 + ... + 34426486.

It is an arithmetic number, because the mean of its divisors is an integer number (1473794611200).

Almost surely, 2^{21211111012201} is an apocalyptic number.

It is an amenable number.

21211111012201 is a deficient number, since it is larger than the sum of its proper divisors (2369602766999).

21211111012201 is a wasteful number, since it uses less digits than its factorization.

21211111012201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68231780.

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

Adding to 21211111012201 its reverse (10221011111212), we get a palindrome (31432122123413).

The spelling of 21211111012201 in words is "twenty-one trillion, two hundred eleven billion, one hundred eleven million, twelve thousand, two hundred one".