2102100120 has 64 divisors (see below), whose sum is σ = 7007004000. Its totient is φ = 560559744.

The previous prime is 2102100103. The next prime is 2102100127. The reversal of 2102100120 is 210012012.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2102100127) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 972115 + ... + 974274.

Almost surely, 2^2102100120 is an apocalyptic number.

2102100120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2102100120 is an abundant number, since it is smaller than the sum of its proper divisors (4904903880).

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

2102100120 is a wasteful number, since it uses less digits than its factorization.

2102100120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1946409 (or 1946399 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 2102100120 is about 45848.6654113290. The cubic root of 2102100120 is about 1281.0059068773.

Adding to 2102100120 its reverse (210012012), we get a palindrome (2312112132).

The spelling of 2102100120 in words is "two billion, one hundred two million, one hundred thousand, one hundred twenty".