222100021221100 has 72 divisors (see below), whose sum is σ = 530976979892016. Its totient is φ = 79964004000000.

The previous prime is 222100021221059. The next prime is 222100021221107. The reversal of 222100021221100 is 1122120001222.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (222100021221107) 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, 999438951 + ... + 999661150.

It is an arithmetic number, because the mean of its divisors is an integer number (7374680276278).

Almost surely, 2^{222100021221100} is an apocalyptic number.

222100021221100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

222100021221100 is an abundant number, since it is smaller than the sum of its proper divisors (308876958670916).

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

222100021221100 is a wasteful number, since it uses less digits than its factorization.

222100021221100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1999100227 (or 1999100220 counting only the distinct ones).

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

Adding to 222100021221100 its reverse (1122120001222), we get a palindrome (223222141222322).

The spelling of 222100021221100 in words is "two hundred twenty-two trillion, one hundred billion, twenty-one million, two hundred twenty-one thousand, one hundred".