21211122201 has 8 divisors (see below), whose sum is σ = 29045861184. Its totient is φ = 13758565680.

The previous prime is 21211122199. The next prime is 21211122227. The reversal of 21211122201 is 10222111212.

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

It is not a de Polignac number, because 21211122201 - 2¹ = 21211122199 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21211112201) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 95545485 + ... + 95545706.

It is an arithmetic number, because the mean of its divisors is an integer number (3630732648).

Almost surely, 2^21211122201 is an apocalyptic number.

It is an amenable number.

21211122201 is a deficient number, since it is larger than the sum of its proper divisors (7834738983).

21211122201 is a wasteful number, since it uses less digits than its factorization.

21211122201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191091231.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21211122201 its reverse (10222111212), we get a palindrome (31433233413).

The spelling of 21211122201 in words is "twenty-one billion, two hundred eleven million, one hundred twenty-two thousand, two hundred one".