21112220201 has 4 divisors (see below), whose sum is σ = 21123144132. Its totient is φ = 21101296272.

The previous prime is 21112220113. The next prime is 21112220203. The reversal of 21112220201 is 10202221112.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6942888976 + 14169331225 = 83324^2 + 119035^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21112220201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21112220203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5459066 + ... + 5462931.

It is an arithmetic number, because the mean of its divisors is an integer number (5280786033).

Almost surely, 2^21112220201 is an apocalyptic number.

It is an amenable number.

21112220201 is a deficient number, since it is larger than the sum of its proper divisors (10923931).

21112220201 is a wasteful number, since it uses less digits than its factorization.

21112220201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10923930.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21112220201 its reverse (10202221112), we get a palindrome (31314441313).

The spelling of 21112220201 in words is "twenty-one billion, one hundred twelve million, two hundred twenty thousand, two hundred one".