2222121201100 has 72 divisors (see below), whose sum is σ = 4848182696448. Its totient is φ = 884028532800.

The previous prime is 2222121201073. The next prime is 2222121201109. The reversal of 2222121201100 is 11021212222.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (2222121201109) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 31340289 + ... + 31411111.

It is an arithmetic number, because the mean of its divisors is an integer number (67335870784).

Almost surely, 2^{2222121201100} is an apocalyptic number.

2222121201100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2222121201100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2424091348224).

2222121201100 is an abundant number, since it is smaller than the sum of its proper divisors (2626061495348).

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

2222121201100 is a wasteful number, since it uses less digits than its factorization.

2222121201100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72535 (or 72528 counting only the distinct ones).

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

Adding to 2222121201100 its reverse (11021212222), we get a palindrome (2233142413322).

The spelling of 2222121201100 in words is "two trillion, two hundred twenty-two billion, one hundred twenty-one million, two hundred one thousand, one hundred".