21222201101 has 4 divisors (see below), whose sum is σ = 21739815804. Its totient is φ = 20704586400.

The previous prime is 21222201047. The next prime is 21222201149. The reversal of 21222201101 is 10110222212.

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 7556824900 + 13665376201 = 86930^2 + 116899^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21222201101 is a prime.

It is a super-2 number, since 2×21222201101² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21222201181) 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, 258807290 + ... + 258807371.

It is an arithmetic number, because the mean of its divisors is an integer number (5434953951).

Almost surely, 2^21222201101 is an apocalyptic number.

It is an amenable number.

21222201101 is a deficient number, since it is larger than the sum of its proper divisors (517614703).

21222201101 is an equidigital number, since it uses as much as digits as its factorization.

21222201101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 517614702.

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

Adding to 21222201101 its reverse (10110222212), we get a palindrome (31332423313).

The spelling of 21222201101 in words is "twenty-one billion, two hundred twenty-two million, two hundred one thousand, one hundred one".