1210001100120 has 64 divisors (see below), whose sum is σ = 4033337004000. Its totient is φ = 322666959744.

The previous prime is 1210001100067. The next prime is 1210001100193. The reversal of 1210001100120 is 210011000121.

It is a happy number.

It is a super-2 number, since 2×1210001100120² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 560184615 + ... + 560186774.

Almost surely, 2^{1210001100120} is an apocalyptic number.

1210001100120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1210001100120 is an abundant number, since it is smaller than the sum of its proper divisors (2823335903880).

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

1210001100120 is a wasteful number, since it uses less digits than its factorization.

1210001100120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1120371409 (or 1120371399 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 1210001100120 its reverse (210011000121), we get a palindrome (1420012100241).

Subtracting from 1210001100120 its reverse (210011000121), we obtain a palindrome (999990099999).

The spelling of 1210001100120 in words is "one trillion, two hundred ten billion, one million, one hundred thousand, one hundred twenty".