2121222210100 has 72 divisors (see below), whose sum is σ = 5312716714368. Its totient is φ = 720075408000.

The previous prime is 2121222210097. The next prime is 2121222210101. The reversal of 2121222210100 is 10122221212.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121222210101) 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, 14930872 + ... + 15072271.

It is an arithmetic number, because the mean of its divisors is an integer number (73787732144).

Almost surely, 2^{2121222210100} is an apocalyptic number.

2121222210100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2121222210100 is an abundant number, since it is smaller than the sum of its proper divisors (3191494504268).

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

2121222210100 is a wasteful number, since it uses less digits than its factorization.

2121222210100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30003265 (or 30003258 counting only the distinct ones).

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

Adding to 2121222210100 its reverse (10122221212), we get a palindrome (2131344431312).

The spelling of 2121222210100 in words is "two trillion, one hundred twenty-one billion, two hundred twenty-two million, two hundred ten thousand, one hundred".