1201222112100 has 72 divisors (see below), whose sum is σ = 3476544341088. Its totient is φ = 320232960000.

The previous prime is 1201222112099. The next prime is 1201222112107. The reversal of 1201222112100 is 12112221021.

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 1201222112100.

It is not an unprimeable number, because it can be changed into a prime (1201222112107) 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, 457975 + ... + 1616225.

Almost surely, 2^{1201222112100} is an apocalyptic number.

1201222112100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1201222112100 is an abundant number, since it is smaller than the sum of its proper divisors (2275322228988).

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

1201222112100 is a wasteful number, since it uses less digits than its factorization.

1201222112100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1161725 (or 1161718 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 1201222112100 its reverse (12112221021), we get a palindrome (1213334333121).

The spelling of 1201222112100 in words is "one trillion, two hundred one billion, two hundred twenty-two million, one hundred twelve thousand, one hundred".