21201111201 has 8 divisors (see below), whose sum is σ = 28275663520. Its totient is φ = 14130316512.

The previous prime is 21201111199. The next prime is 21201111301. The reversal of 21201111201 is 10211110212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21201111201 - 2¹ = 21201111199 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21201111101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 926215 + ... + 948828.

It is an arithmetic number, because the mean of its divisors is an integer number (3534457940).

Almost surely, 2^21201111201 is an apocalyptic number.

It is an amenable number.

21201111201 is a deficient number, since it is larger than the sum of its proper divisors (7074552319).

21201111201 is a wasteful number, since it uses less digits than its factorization.

21201111201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1878815.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 21201111201 its reverse (10211110212), we get a palindrome (31412221413).

The spelling of 21201111201 in words is "twenty-one billion, two hundred one million, one hundred eleven thousand, two hundred one".