1222012220100 has 432 divisors, whose sum is σ = 4327210540800. Its totient is φ = 265134643200.

The previous prime is 1222012220057. The next prime is 1222012220101. The reversal of 1222012220100 is 10222102221.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 1222012220100.

It is not an unprimeable number, because it can be changed into a prime (1222012220101) by changing a digit.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 22272501 + ... + 22327299.

Almost surely, 2^{1222012220100} is an apocalyptic number.

1222012220100 is a gapful number since it is divisible by the number (10) 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 1222012220100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2163605270400).

1222012220100 is an abundant number, since it is smaller than the sum of its proper divisors (3105198320700).

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

1222012220100 is a wasteful number, since it uses less digits than its factorization.

1222012220100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54908 (or 54894 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 1222012220100 its reverse (10222102221), we get a palindrome (1232234322321).

The spelling of 1222012220100 in words is "one trillion, two hundred twenty-two billion, twelve million, two hundred twenty thousand, one hundred".