1201323522100 has 72 divisors (see below), whose sum is σ = 2883276470648. Its totient is φ = 431577331200.

The previous prime is 1201323522089. The next prime is 1201323522107. The reversal of 1201323522100 is 12253231021.

It can be written as a sum of positive squares in 12 ways, for example, as 38734963344 + 1162588558756 = 196812^2 + 1078234^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1201323522107) 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, 12439671 + ... + 12535870.

Almost surely, 2^{1201323522100} is an apocalyptic number.

1201323522100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1201323522100 is an abundant number, since it is smaller than the sum of its proper divisors (1681952948548).

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

1201323522100 is a wasteful number, since it uses less digits than its factorization.

1201323522100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24975605 (or 24975598 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 22.

Adding to 1201323522100 its reverse (12253231021), we get a palindrome (1213576753121).

The spelling of 1201323522100 in words is "one trillion, two hundred one billion, three hundred twenty-three million, five hundred twenty-two thousand, one hundred".