21222211201 has 4 divisors (see below), whose sum is σ = 21224055600. Its totient is φ = 21220366804.

The previous prime is 21222211183. The next prime is 21222211211. The reversal of 21222211201 is 10211222212.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21222211201 - 2⁹ = 21222210689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21222211211) 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, 904831 + ... + 927988.

It is an arithmetic number, because the mean of its divisors is an integer number (5306013900).

Almost surely, 2^21222211201 is an apocalyptic number.

It is an amenable number.

21222211201 is a deficient number, since it is larger than the sum of its proper divisors (1844399).

21222211201 is a wasteful number, since it uses less digits than its factorization.

21222211201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1844398.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21222211201 its reverse (10211222212), we get a palindrome (31433433413).

The spelling of 21222211201 in words is "twenty-one billion, two hundred twenty-two million, two hundred eleven thousand, two hundred one".