22221022012100 has 18 divisors (see below), whose sum is σ = 48219617766474. Its totient is φ = 8888408804800.

The previous prime is 22221022012087. The next prime is 22221022012141. The reversal of 22221022012100 is 121022012222.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 2687874996676 + 19533147015424 = 1639474^2 + 4419632^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 111105109961 + ... + 111105110160.

It is an arithmetic number, because the mean of its divisors is an integer number (2678867653693).

Almost surely, 2^{22221022012100} is an apocalyptic number.

22221022012100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22221022012100 is an abundant number, since it is smaller than the sum of its proper divisors (25998595754374).

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

22221022012100 is a wasteful number, since it uses less digits than its factorization.

22221022012100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222210220135 (or 222210220128 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 22221022012100 its reverse (121022012222), we get a palindrome (22342044024322).

The spelling of 22221022012100 in words is "twenty-two trillion, two hundred twenty-one billion, twenty-two million, twelve thousand, one hundred".