1210100120 has 128 divisors (see below), whose sum is σ = 3055320000. Its totient is φ = 428654592.

The previous prime is 1210100119. The next prime is 1210100147. The reversal of 1210100120 is 210010121.

It is a Harshad number since it is a multiple of its sum of digits (8).

It is a junction number, because it is equal to n+sod(n) for n = 1210100098 and 1210100107.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2958476 + ... + 2958884.

Almost surely, 2^1210100120 is an apocalyptic number.

1210100120 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 1210100120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1527660000).

1210100120 is an abundant number, since it is smaller than the sum of its proper divisors (1845219880).

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

1210100120 is a wasteful number, since it uses less digits than its factorization.

1210100120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 685 (or 681 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 8.

The square root of 1210100120 is about 34786.4933558989. The cubic root of 1210100120 is about 1065.6316266161.

Adding to 1210100120 its reverse (210010121), we get a palindrome (1420110241).

The spelling of 1210100120 in words is "one billion, two hundred ten million, one hundred thousand, one hundred twenty".