21101221122 has 8 divisors (see below), whose sum is σ = 42202442256. Its totient is φ = 7033740372.

The previous prime is 21101221103. The next prime is 21101221129. The reversal of 21101221122 is 22112210112.

It is a sphenic number, since it is the product of 3 distinct primes.

21101221122 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (21101221129) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1758435088 + ... + 1758435099.

It is an arithmetic number, because the mean of its divisors is an integer number (5275305282).

Almost surely, 2^21101221122 is an apocalyptic number.

21101221122 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21101221122 is a wasteful number, since it uses less digits than its factorization.

21101221122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3516870192.

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

Adding to 21101221122 its reverse (22112210112), we get a palindrome (43213431234).

The spelling of 21101221122 in words is "twenty-one billion, one hundred one million, two hundred twenty-one thousand, one hundred twenty-two".