1201243638100 has 72 divisors (see below), whose sum is σ = 2849814350208. Its totient is φ = 435872236800.

The previous prime is 1201243638083. The next prime is 1201243638107. The reversal of 1201243638100 is 18363421021.

It is a super-2 number, since 2×1201243638100² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1201243638107) 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, 670009 + ... + 1688608.

It is an arithmetic number, because the mean of its divisors is an integer number (39580754864).

Almost surely, 2^{1201243638100} is an apocalyptic number.

1201243638100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1201243638100 is an abundant number, since it is smaller than the sum of its proper divisors (1648570712108).

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

1201243638100 is a wasteful number, since it uses less digits than its factorization.

1201243638100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2359105 (or 2359098 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 31.

The spelling of 1201243638100 in words is "one trillion, two hundred one billion, two hundred forty-three million, six hundred thirty-eight thousand, one hundred".