21101121222 has 32 divisors (see below), whose sum is σ = 43374776832. Its totient is φ = 6840191904.

The previous prime is 21101121221. The next prime is 21101121253. The reversal of 21101121222 is 22212110112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21101121221) 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, 194028 + ... + 282575.

It is an arithmetic number, because the mean of its divisors is an integer number (1355461776).

Almost surely, 2^21101121222 is an apocalyptic number.

21101121222 is an abundant number, since it is smaller than the sum of its proper divisors (22273655610).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21101121222 is a wasteful number, since it uses less digits than its factorization.

21101121222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 476812.

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

Adding to 21101121222 its reverse (22212110112), we get a palindrome (43313231334).

The spelling of 21101121222 in words is "twenty-one billion, one hundred one million, one hundred twenty-one thousand, two hundred twenty-two".