21101201222 has 32 divisors (see below), whose sum is σ = 33710173920. Its totient is φ = 9878077440.

The previous prime is 21101201221. The next prime is 21101201287. The reversal of 21101201222 is 22210210112.

It is a super-2 number, since 2×21101201222² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21101201197 and 21101201206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21101201221) 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 15 ways as a sum of consecutive naturals, for example, 1508822 + ... + 1522742.

It is an arithmetic number, because the mean of its divisors is an integer number (1053442935).

Almost surely, 2^21101201222 is an apocalyptic number.

21101201222 is a deficient number, since it is larger than the sum of its proper divisors (12608972698).

21101201222 is a wasteful number, since it uses less digits than its factorization.

21101201222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14408.

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

Adding to 21101201222 its reverse (22210210112), we get a palindrome (43311411334).

The spelling of 21101201222 in words is "twenty-one billion, one hundred one million, two hundred one thousand, two hundred twenty-two".